Basic Formulas of Geometry

In a circle, the radius equals...

• half of the diameter

• 2 x diameter

• half of pi

• 2 x pi

How do you find the circumference of a circle?

• 2 x diameter

• 2 x pi x radius

• pi x diameter

In formulas for Surface Area and Volume, what does B mean? (capital B)

• the base

• always means

  length x width

• area of the base

What is area?

• The amount of space inside a 2-D object.

• The amount of space inside a 3-D object.

• The distance around a 2-D shape.

• The distance around a 3-D shape.

• The amount of space covering a 3-D shape.

Find the area of a triangle with a height of 10 in and base of 12 in. Use the correct formula: A = bh A = 1/2 bh C = 2b + 2h

• 120 in

• 120 in²

• 60 in²

• 44 in

Find the circumference of a circle whose radius is 3 inches.

Use the correct formula.

A = πr²

C = 2πr

π= 3.14

• 18.84 in²

• 18.84 in

• 28.26 in²

• 28.26 in

Find the perimeter of the figure below.

• 21 cm

• 21 cm²

• 1080 cm

• 1080 cm²

Find the total area of the figure. Use the correct formulas. A = lw A = 1/2 bh A = bh A = 1/2 (b1 + b2)h

• 120 cm2

• 96 cm²

• 108 cm²

• 60cm²

Find the volume of the rectangular solid.

Use the correct formula.

V = lwh

SA = 2lw + 2lh + 2wh

A = lw

• 210 cm²

• 210cm³

• 214 cm²

• 214 cm³

Rectangle EFGH is similar to rectangle PQRS. If EF = 8, FG = 12 and PQ = 4, find QR.

• 12

• 10

• 8

• 6