ACT Area Formulas

Front

What is the formula for the area of a circle?

Back

A = πr²

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

C = 2πr

Tags

CCSS.7.G.B.4

Front

What is the formula for the volume of a cylinder?

Back

V = πr²h

Tags

CCSS.8.G.C.9

CCSS.HSG.GMD.A.3

Front

How do you calculate the area of a circle with a radius of 3 cm?

Back

A = π(3)² = 28.26 cm²

Tags

CCSS.7.G.B.4

Front

If the radius of a circle is doubled, how does the area change?

Back

The area increases by a factor of four (A = π(2r)² = 4πr²).

Tags

CCSS.7.G.B.4

Front

What is the relationship between the radius and diameter of a circle?

Back

The diameter is twice the radius (d = 2r).

Front

How do you find the volume of a cylinder with a radius of 5 cm and a height of 10 cm?

Back

V = π(5)²(10) = 250π cm³.

Tags

CCSS.8.G.C.9

CCSS.HSG.GMD.A.3

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14.

Tags

CCSS.HSG.GMD.A.1

Front

What units are used for measuring area?

Back

Square units (e.g., cm², m²).

Tags

CCSS.3.MD.C.6

Front

What units are used for measuring volume?

Back

Cubic units (e.g., cm³, m³).

Tags

CCSS.5.MD.C.3A

CCSS.5.MD.C.3B

CCSS.5.MD.C.4