Area and Circumference

Front

What is the formula for the area of a circle?

Back

A = π × r²

Front

What is the formula for the circumference of a circle?

Back

C = 2 × π × r

Front

If the radius of a circle is 9 in, what is the area?

Back

254.34 in²

Front

If the radius of a circle is 9 in, what is the circumference?

Back

56.55 in

Front

What is the diameter of a circle if the radius is 9 in?

Back

18 in

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius

Front

What is the value of π (pi) approximately?

Back

3.14

Front

If the diameter of a circle is 7 m, what is the radius?

Back

3.5 m

Front

How do you convert radius to diameter?

Back

Multiply the radius by 2.

Front

What is the area of a circle with a radius of 10 in?

Back

314.16 in²