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Quizzes > Mathematics

Geometry Quiz: Test Your Trivia on Angles, Shapes, and Theorems

Quick, free geometry trivia check. Instant results.

Editorial: Review CompletedCreated By: Dr.Priyanka VermaUpdated Aug 28, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration for a free interactive geometry trivia quiz on a sky blue background

This geometry quiz helps you practice angles, shapes, and theorems and see where you stand. For a refresher, try a basic geometry quiz or a geometry chapter 1 quiz, or explore foundations with a euclidean geometry quiz. Get instant feedback to learn as you go.

What is the sum of the interior angles of any triangle?
180°
270°
90°
360°
The sum of the three interior angles in any triangle is always 180°. This is a fundamental property in Euclidean geometry. You can see more details on triangle angle sums here: .
A right angle measures how many degrees?
60°
45°
120°
90°
By definition, a right angle is exactly 90 degrees. It represents one quarter of a full rotation. Learn more about right angles here: .
In a parallelogram, which property do opposite sides always share?
They are parallel only
They are perpendicular
They are equal in length only
They are both parallel and equal in length
Opposite sides of a parallelogram are both parallel and congruent (equal in length). This is one of the defining characteristics of parallelograms. See details here: .
How many lines of symmetry does a square have?
8
2
4
Infinite
A square has four lines of symmetry: two through the midpoints of opposite sides and two along its diagonals. Each line divides the square into mirror-image halves. More on this here: .
In a right triangle with legs of length 6 and 8, what is the length of the hypotenuse?
12
10
14
8
By the Pythagorean theorem, c² = a² + b², so c² = 6² + 8² = 36 + 64 = 100, and c = 10. Read more at: .
What is the formula for the area of a circle with radius r?
2?r
?d^2/4
?r^2
?d^2
The area of a circle is given by A = ?r², where r is the radius. This arises from integral calculus or geometric approximation methods. More info: .
If two parallel lines are cut by a transversal, what is the relationship between their alternate interior angles?
They are supplementary
They are vertical angles
They are congruent
They are complementary
When two lines are parallel and intersected by a transversal, each pair of alternate interior angles are equal (congruent). This is a key parallel lines property. More details: .
What is the sum of the interior angles of a convex quadrilateral?
180°
540°
270°
360°
A convex quadrilateral can be divided into two triangles, each summing to 180°, so 2 × 180° = 360° for the quadrilateral. See more: .
What is the circumradius of a triangle with side lengths 7, 8, and 9?
Approximately 11.2
Approximately 4.7
Approximately 2.3
Approximately 7.8
The circumradius R = (a·b·c)/(4·Area). Using Heron's formula, the area ? 26.83, so R ? (7·8·9)/(4·26.83) ? 4.7. More at: .
How many diagonals does a regular dodecagon (12-sided polygon) have?
66
45
54
60
A polygon with n sides has n(n-3)/2 diagonals. For n = 12, that gives 12 × 9 / 2 = 54 diagonals. Further reading: .
What is the volume of a regular tetrahedron with edge length a?
a^3 / (2?2)
a^3 / (3?3)
a^3 / (6?2)
a^3 / (12?2)
The volume of a regular tetrahedron is V = a³ / (6?2). This derives from the formula for a pyramid with an equilateral triangle base. Details: .
A triangle has side lengths 13, 14, and 15. What is its inradius?
5
4
6
3
The inradius r = Area / semiperimeter. Here s = (13+14+15)/2 = 21, area by Heron's formula = 84, so r = 84 / 21 = 4. See more: .
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Study Outcomes

  1. Understand triangle classifications -

    Identify triangles by side length and angle measures, and explain their defining properties to solve geometry questions involving various triangle types.

  2. Apply circle theorems -

    Use central and inscribed angle rules, as well as arc length relationships, to determine missing values and answer interactive geometry quiz problems.

  3. Distinguish line relationships -

    Analyze parallel and perpendicular lines along with transversals to find angle measures and deepen geometry trivia practice.

  4. Compute polygon angles -

    Calculate interior and exterior angles of polygons using sum formulas, enhancing accuracy in solving a variety of geometry questions.

  5. Recall fundamental theorems -

    Describe and apply key theorems such as the Pythagorean theorem and angle-sum theorem to confidently tackle easy and challenging geometry quiz items.

  6. Enhance problem-solving speed -

    Build quick recognition of geometry concepts and improve accuracy for a more efficient and engaging geometry trivia experience.

Cheat Sheet

  1. Pythagorean Theorem -

    The Pythagorean Theorem (c² = a² + b²) is the cornerstone of right-triangle geometry, allowing you to calculate the hypotenuse given the legs. For example, a 3 - 4 - 5 triangle confirms 3² + 4² = 5², a fact often featured in geometry trivia and university courses.

  2. Triangle Angle Sum -

    Every triangle's interior angles sum to 180°, a fact proven in Euclid's Elements and emphasized in high-school geometry. When you know two angles, subtract their sum from 180° to find the third - an essential trick for quick geometry quiz success.

  3. Circle Formulas -

    Understanding that circumference C = 2πr and area A = πr² (mnemonic: "2 Pie Are Square") equips you for circle-based geometry questions in any trivia. These formulas are validated by official math curricula and backed by resources like university geometry departments.

  4. Special Right Triangles -

    Memorize the side ratios for 45° - 45° - 90° (1:1:√2) and 30° - 60° - 90° (1:√3:2) triangles to handle geometry practice problems swiftly. These patterns often appear in both easy geometry quizzes and advanced challenge sets.

  5. Basic Trigonometric Ratios -

    Use the SOH-CAH-TOA mnemonic to recall sine = opposite/hypotenuse, cosine = adjacent/hypotenuse, and tangent = opposite/adjacent - tools vital for many geometry quiz questions. This approach is taught in academic journals and math departments as the foundation for trigonometry-based geometry trivia.

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