Area and Circumference of Circles

Front

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

Back

Circumference = 2 * π * r

Front

What is the relationship between the radius and diameter of a circle?

Back

Diameter = 2 * Radius

Front

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

Back

Area = π * r²

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

Diameter = 10 cm

Front

If the radius of a circle is 7 m, what is the circumference?

Back

Circumference = 2 * π * 7 ≈ 43.98 m

Front

What is the value of π (pi) approximately?

Back

π ≈ 3.14

Front

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

Back

Area = π * (d/2)²

Front

If the circumference of a circle is 31.4 cm, what is the radius?

Back

Radius = 31.4 / (2 * π) ≈ 5 cm

Front

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

Back

Circumference = π * 12 ≈ 37.68 inches

Front

What does the term 'radius' refer to in a circle?

Back

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