Area and Circumference of circles

Front

What is the radius of a circle?

Back

The measurement from the center of a circle to an edge of the circle.

Front

How do you calculate the circumference of a circle?

Back

Circumference = 2 × π × radius.

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Front

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

Back

Radius = Diameter / 2 = 5 cm.

Front

What is the diameter of a circle?

Back

The measurement from one edge of the circle to the opposite edge, passing through the center.

Front

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

Back

Circumference = 2 × π × 12.5 mm ≈ 78.5 mm.

Front

A circular window has a diameter of 6 meters. What is its area?

Back

Area = π × (Diameter/2)² = π × (3 m)² ≈ 28.26 m².

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

If the radius is 10 ft, what is the diameter?

Back

Diameter = 2 × 10 ft = 20 ft.

Front

What is π (pi)?

Back

A mathematical constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.