Circles, Circles, Circles

Front

What is the formula for finding the radius of a circle?

Back

r = d/2

Front

What is the symbol for pi?

Back

π

Front

What is the formula for finding the diameter of a circle?

Back

d = 2r

Front

If the circumference is 62.8 inches, what is the radius?

Back

10 inches

Front

What is the radius of a circle with a diameter of 16 inches?

Back

8 inches

Front

What is the formula for finding the circumference of a circle?

Back

C = 2πr

Front

What is the relationship between radius and diameter?

Back

Diameter is twice the radius (d = 2r).

Front

What is the area of a circle with a radius of 5 inches?

Back

A = πr² = 25π square inches.

Front

What is the circumference of a circle with a radius of 7 inches?

Back

C = 2π(7) = 14π inches.

Front

What does the term 'circumference' refer to?

Back

The distance around the circle.