7th Grade Circles Quick-Check

Front

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

Back

C = π·d

Front

What is the circumference of a circle with a diameter of 9 cm?

Back

28.26 cm

Front

What is the area of a circle with a radius of 7 cm?

Back

153.86 cm²

Front

If a circle has a radius of 3 feet, how much paint is needed to cover the circle?

Back

28.26 sq ft

Front

What is the circumference of a circle?

Back

The distance around a circle.

Front

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

Back

A = π·r²

Front

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

Back

The circumference doubles.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius

Front

How do you calculate the diameter of a circle if you know the circumference?

Back

Diameter = Circumference / π

Front

What is the value of π (pi) approximately?

Back

3.14