Circumference & Area of Circles Word Problems

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius of the circle.

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

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

Back

Area = π(5)² = 78.5 square inches.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.

Front

If the diameter of a circle is 10 cm, what is the radius?

Back

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

Front

How do you convert diameter to radius?

Back

Radius = Diameter / 2.

Front

What is the area of a circle with a radius of 7 cm?

Back

Area = π(7)² ≈ 153.94 square centimeters.

Front

What is the circumference of a circle with a radius of 4 inches?

Back

Circumference = 2π(4) ≈ 25.13 inches.

Front

If a circle has an area of 314.16 square inches, what is the radius?

Back

Radius = √(Area/π) = √(314.16/π) ≈ 10 inches.

Front

What is the relationship between diameter and circumference?

Back

Circumference = π × Diameter.