Area and Circumference of circles

Front

What is the formula to find the radius of a circle if the diameter is known?

Back

Radius = Diameter / 2

Front

If the radius of a circle is 9.5 inches, what is the diameter?

Back

Diameter = 19 inches

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × Radius or Circumference = π × Diameter

Front

Calculate the circumference of a circle with a radius of 12.5 mm.

Back

Circumference = 78.5 mm

Front

What is the formula for the area of a circle?

Back

Area = π × Radius²

Front

Find the area of a circle with a radius of 6 ft.

Back

Area = 113.1 ft²

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius

Front

If the diameter of a circle is 20ft, what is the radius?

Back

Radius = 10ft

Front

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

Back

Circumference is the distance around the circle.

Front

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

Back

Area = 78.5 cm²