Area and perimeter

If you had a rectangle and you are finding the perimeter it is a 15 by 23 would it be 76?

you have a triangle slice of pizza and you need the area the base is 8.2cm and the height is 30cm would it be 67.8

Mia goes and gets a pizza for her and her friends and she needs to find the area of the pizza the diameter is 18 is the area 56?

Lily has a pizza slice and wanted to find the area of her slice the base is 8.7cm and the height is 23cm is the area 100.05 ?

Zack needs the same size tire as his old one and needs the circumference. The diameter is 28cm. Is the circumference 33.3?

Brian needs a cake and needs the circumference the diameter is 43 is the circumference 135.02