Optional Circles Review

Front

What is the formula for the circumference of a circle using the radius?

Back

C = 2πr

Front

What is the formula for the circumference of a circle using the diameter?

Back

C = πd

Front

What is the formula used to find the area of a circle?

Back

A = πr²

Front

If the diameter of a circle is 32 inches, what is the radius?

Back

16 inches

Front

What is the term for the distance around a circle?

Back

Circumference

Front

What is the term for the space inside a flat object?

Back

Area

Front

If the radius of a circle is 5 inches, what is the circumference?

Back

C = 2π(5) = 10π inches

Front

If the radius of a circle is 10 inches, what is the area?

Back

A = π(10)² = 100π square inches

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius

Front

What is the formula for the area of a circle in terms of diameter?

Back

A = (π/4) × d²