7th Grade Milestone Review - Circumference and Area of Circles

Front

What is the formula for the circumference of a circle?

Back

C = 2πr or C = πd

Front

If the radius of a circle is 6 ft, what is the circumference?

Back

C = 2π(6) = 12π ≈ 37.68 ft

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius

Front

What is the formula for the area of a circle?

Back

A = πr²

Front

If the diameter of a circle is 15 mm, what is the radius?

Back

Radius = Diameter ÷ 2 = 15 ÷ 2 = 7.5 mm

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14

Front

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

Back

A = π(3)² = 9π ≈ 28.26 cm²

Front

What is the circumference of a circle with a diameter of 10 cm?

Back

C = πd = π(10) ≈ 31.4 cm

Front

If a circle has a radius of 14 cm, what is its diameter?

Back

Diameter = 2 × Radius = 2 × 14 = 28 cm

Front

What is the circumference of a circle with a radius of 18 cm?

Back

C = 2π(18) = 36π ≈ 113.04 cm