Circle Math

Front

What is the radius of a circle?

Back

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

Front

What is the formula to find the area of a circle?

Back

Area = π × radius² (where π is approximately 3.14).

Front

If the radius of a circle is 3 cm, what is the area?

Back

28.26 cm².

Front

What is the diameter of a circle?

Back

The diameter is twice the radius of the circle.

Front

If a circle has a radius of 10 ft, what is its diameter?

Back

The diameter is 20 ft.

Front

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

Back

78.5 cm².

Front

How do you calculate the circumference of a circle?

Back

Circumference = 2 × π × radius.

Front

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

Back

Circumference = 2 × π × 7 cm ≈ 43.98 cm.

Front

What does π (pi) represent in circle math?

Back

π (pi) is a constant approximately equal to 3.14, representing the ratio of the circumference of a circle to its diameter.

Front

If the area of a circle is 50.24 cm², what is the radius?

Back

Radius = √(Area/π) ≈ 4 cm.