Illustrative Math Grade 7 Unit 3 Review

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr or Circumference = πd, where d is the diameter.

Front

If a circle has a radius of 5 inches, what is its area?

Back

Area = π(5)² = 25π ≈ 78.54 inches².

Front

What is a diameter?

Back

A diameter is a line segment that passes through the center of a circle and has its endpoints on the circle.

Front

If the circumference of a circle is 63 inches, what is the radius?

Back

Radius = Circumference / (2π) = 63 / (2π) ≈ 10 inches.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius (d = 2r).

Front

What is a radius?

Back

A radius is a line segment from the center of a circle to any point on the circle.

Front

If a circle has a diameter of 10 inches, what is its radius?

Back

Radius = Diameter / 2 = 10 / 2 = 5 inches.

Front

What is the area of a circle with a diameter of 12 inches?

Back

Area = π(6)² = 36π ≈ 113.1 inches².

Front

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

Back

Circumference = 2π(7) = 14π ≈ 43.98 inches.