7th Grade Milestone Review - Circumference and Area of Circles

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × radius or Circumference = π × diameter.

Front

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

Back

Circumference = 2 × π × 6 ft ≈ 37.68 ft.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.

Front

If the diameter of a circle is 12 cm, what is the radius?

Back

Radius = diameter ÷ 2 = 12 cm ÷ 2 = 6 cm.

Front

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

Back

Area = π × radius² = π × (5 cm)² ≈ 78.54 cm².

Front

How do you find the area of a circle?

Back

Area = π × radius².

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Front

If a bicycle tire has a diameter of 20 inches, what is the circumference?

Back

Circumference = π × diameter = π × 20 in ≈ 62.8 in.

Front

What is the circumference of a circle with a diameter of 13.5 inches?

Back

Circumference = π × 13.5 in ≈ 42.39 in.

Front

What is the formula for the area of a circle?

Back

Area = π × radius².