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Quizzes > Mathematics

Are All Trapezoids Parallelograms? True or False Quiz

Quick, 20-question trapezoid vs parallelogram quiz. Instant results.

Editorial: Review CompletedCreated By: Craigory KiesznowskiUpdated Aug 27, 2025
Difficulty: Moderate
Grade: Grade 7
Study OutcomesCheat Sheet
Paper art promoting The Trapezoid Truth Test, a dynamic geometry quiz for high school students.

This quiz helps you decide whether all trapezoids are parallelograms and see why with 20 quick true-or-false statements. Brush up on side and angle rules, compare shapes in a quadrilateral properties test, and review right angles in a trapezoid to avoid common mix-ups. Get instant results and see where to study next.

Which of the following best describes a trapezoid?
A quadrilateral with no parallel sides
A quadrilateral with exactly one pair of parallel sides
A triangle with one pair of equal angles
A quadrilateral with two pairs of parallel sides
A trapezoid is defined as a quadrilateral with exactly one pair of parallel sides, which distinguishes it from parallelograms. This answer meets the accepted geometric definition for trapezoids.
What key side property distinguishes a trapezoid from a parallelogram?
No parallel sides
Exactly one pair of parallel sides
All sides are equal
Two pairs of parallel sides
A trapezoid is defined by having exactly one pair of parallel sides, while a parallelogram has two pairs of parallel sides. This makes the first option the correct answer.
The bases of a trapezoid are:
The parallel sides
The angles between the legs
The non-parallel sides
The diagonals connecting opposite corners
In a trapezoid, the bases refer to the pair of parallel sides. The remaining sides are called legs, making the first option correct based on standard geometry definitions.
True or False: All trapezoids are parallelograms.
Sometimes True
True
Cannot be determined
False
Not all trapezoids are parallelograms because parallelograms require two pairs of parallel sides, while trapezoids only have one pair. Therefore, the correct answer is False.
In geometry, a quadrilateral can be called a trapezoid if it has:
One pair of parallel sides
Four equal sides with right angles
No parallel sides
Two pairs of parallel sides
The definition of a trapezoid rests on having one pair of parallel sides. This is the feature that distinguishes it from other quadrilaterals, confirming the first option as the correct answer.
What is the midsegment of a trapezoid?
A line parallel to the legs
A line through the intersection of diagonals
A line segment connecting opposite vertices
A line segment connecting the midpoints of the legs, parallel to the bases, whose length is the average of the bases
The midsegment of a trapezoid connects the midpoints of the non-parallel sides and is parallel to the bases. Its length is the average of the lengths of the bases, making the first option correct.
Which formula correctly computes the area of a trapezoid?
Height² + Base1 + Base2
Base Ă- Height
(Base1 Ă- Base2) / Height
(Base1 + Base2) / 2 Ă- Height
The area of a trapezoid is calculated by taking the average of the two bases and multiplying by the height. This is exactly represented in option A.
In an isosceles trapezoid, which of the following is true about its legs?
The legs are congruent
The legs form right angles with each other
The legs are perpendicular to the bases
The legs are the same length as the bases
An isosceles trapezoid is characterized by having legs that are congruent, meaning the non-parallel sides are equal in length. This property makes the first option the correct answer.
Which statement about the angles in a trapezoid is true?
Consecutive angles between a leg and the bases are supplementary
Only the angles at the base are congruent
All four angles are congruent
Opposite angles are supplementary
In a trapezoid, the angles on each side of a leg are supplementary because the leg acts as a transversal cutting through parallel bases. This makes the first option correct.
A trapezoid has bases of length 8 and 14 and a height of 5. What is its area?
110
60
55
35
The area of a trapezoid is calculated using the formula ((Base1 + Base2) / 2) Ă- Height. Substituting the given values, ((8 + 14)/2) Ă- 5 equals 55, making option A correct.
If a trapezoid's legs are extended, they will eventually:
Form a parallelogram
Remain parallel to each other
Meet at a point due to the non-parallel nature of the legs
Always be perpendicular to each other
Since the legs of a trapezoid are not parallel, when extended they will eventually intersect at a point. This behavior confirms the correctness of option A.
How does one determine if a trapezoid is isosceles based on its angles?
The angles between the bases are equal
The base angles are congruent
The angles at one base are supplementary
The diagonals are perpendicular
An isosceles trapezoid is identified by its congruent base angles. When both base angles adjacent to each base are equal, it confirms the trapezoid is isosceles, making the first option correct.
Which of the following properties distinguishes a trapezoid from a kite?
A trapezoid has equal angles; a kite does not
A trapezoid always has diagonals that are perpendicular
A trapezoid has one pair of parallel sides, whereas a kite does not
A trapezoid has two pairs of congruent sides; a kite does not
The defining feature of a trapezoid is that it has one pair of parallel sides. A kite, on the other hand, does not have this property, which makes option A the correct distinguishing characteristic.
Which pair of segments in a trapezoid is always parallel?
The legs
The diagonals
The bases
The midsegment and one leg
By definition, a trapezoid has one pair of parallel sides, which are its bases. This makes the first option correct.
How does the length of the midsegment in a trapezoid relate to the lengths of its bases?
It is the difference between the bases
It is equal to half the sum of the bases
It is the product of the bases
It is the sum of the bases
The midsegment of a trapezoid is defined as the segment that is parallel to the bases and whose length is half the sum of the bases. This definition confirms option A as correct.
In an isosceles trapezoid, what is a unique property of its diagonals?
They are of unequal lengths
They are perpendicular
They are congruent
They bisect each other
A defining characteristic of an isosceles trapezoid is that its diagonals are congruent, meaning they are equal in length. This unique property sets isosceles trapezoids apart from other types of trapezoids.
A trapezoid is divided by one of its diagonals into two triangles. How are the areas of these triangles generally related?
They are always equal
The areas are not necessarily equal if the trapezoid is not isosceles
One triangle's area is always twice the other's
They always have perimeters that are equal
Dividing a general trapezoid with a diagonal does not guarantee that the resulting triangles will have equal areas, unless the trapezoid is isosceles or exhibits additional symmetry. Therefore, option A is correct.
Which transformation preserves the area and parallelism of the bases of a trapezoid but can change its angles and side lengths?
Reflection
Dilation
Rotation
Shear transformation
A shear transformation shifts points parallel to a fixed line, preserving both area and the parallelism of the bases of a trapezoid while altering angles and the lengths of non-parallel sides. This makes option A the correct answer.
If a trapezoid's midsegment is known to be 10 units long, what can be inferred about the sum of the lengths of its bases?
The sum is 20 units
The sum is 5 units
There is not enough information to determine the sum
The sum is 10 units
Since the midsegment of a trapezoid is equal to half the sum of its bases, a midsegment measuring 10 units indicates that the sum of the bases must be 20 units. This direct relationship confirms option A as correct.
Which of the following is a necessary and sufficient condition for a trapezoid to be classified as a parallelogram?
The midsegment is equal in length to one of the bases
The diagonals are perpendicular
Both pairs of opposite sides are parallel
One pair of adjacent angles are congruent
For any quadrilateral to be classified as a parallelogram, it must have both pairs of opposite sides parallel. Thus, for a trapezoid to be a parallelogram, this condition must be met, making option A the necessary and sufficient condition.
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Study Outcomes

  1. Define and describe the key properties of trapezoids.
  2. Differentiate between trapezoids and parallelograms based on their geometric properties.
  3. Analyze the truth of common statements regarding trapezoidal features.
  4. Apply dynamic geometry reasoning to solve problems involving trapezoids.
  5. Evaluate geometric proofs to justify conclusions about trapezoid classification.

True/False Quiz: Trapezoids & Parallelograms? Cheat Sheet

  1. What is a trapezoid? - A trapezoid is a four‑sided shape that has exactly one pair of parallel sides (the bases) and two non‑parallel sides (the legs). Think of it like a wobbly table top where only two sides match up perfectly! Dive deeper at .
  2. Calculating the area - To find a trapezoid's area, add the lengths of the two bases, divide by two, then multiply by the height. It's like finding the average base length and stretching it up to the height - voilà, you've got area! Check out the step‑by‑step walkthrough at .
  3. Finding the perimeter - The perimeter is simply the sum of all four sides: base₝ + base₂ + leg₝ + leg₂. It's a no‑frills, straight‑forward addition that tells you how much border there is around your trapezoid. Learn more at .
  4. Isosceles trapezoid traits - In an isosceles trapezoid, the two legs are equal in length, so the base angles match up perfectly. This symmetry makes it a crowd favorite in proofs and problem‑solving! Get the full scoop at .
  5. Equal diagonals - A cool trick: the diagonals of an isosceles trapezoid are congruent and bisect each other into equal parts. That symmetry can save you tonnes of time when you're tackling geometry homework! Read more at .
  6. The trapezoid median - The median (or midsegment) connects the midpoints of the legs, runs parallel to the bases, and its length is the average of the two bases. Think of it as the trapezoid's "comfort zone" right in the middle! Explore further at .
  7. Sum of interior angles - All quadrilaterals, trapezoids included, have interior angles that add up to 360°. It's like a full circle broken into four corners - geometry's little party trick! Brush up at .
  8. Right trapezoid basics - A right trapezoid features one leg perpendicular to the bases, creating two right angles. This makes area and height calculations super straightforward! Check examples at .
  9. Supplementary side angles - The angles on the same side of a trapezoid always add up to 180°, making them supplementary. It's a handy fact that shows up in many geometry puzzles. Discover more at .
  10. Real‑world trapezoids - Spot trapezoids in everyday life: lampshades, bridges, handbags, and even some pizza slices! Seeing geometry in action makes learning way more fun and practical. Find inspiration at .
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