Area, Perimeter, and Circumference

Front

What is the definition of radius?

Back

The radius is the distance from the center of a circle to any point on its circumference.

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 9, what is the diameter?

Back

Diameter = 2 × radius = 2 × 9 = 18.

Front

What is the formula for the area of a rectangle?

Back

Area = length × width.

Front

If a rectangle has a length of 5 cm and a width of 8 cm, what is its area?

Back

Area = 5 cm × 8 cm = 40 square centimeters.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Front

If the radius of a circle is 13.5 mm, what is the area?

Back

Area = π × (13.5 mm)² ≈ 571.53 mm².

Front

What is the circumference of a circle with a diameter of 50 yards?

Back

Circumference = π × diameter = π × 50 ≈ 157.08 yards.

Front

What is the definition of perimeter?

Back

Perimeter is the total distance around a two-dimensional shape.