Circumference and Area

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × r, where r is the radius.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

If the radius of a circle is 7 cm, what is the area?

Back

154 cm² (Area = π × 7²).

Front

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

Back

62.83 cm (Circumference = 2 × π × 10).

Front

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

Back

10 cm (Diameter = 2 × Radius).

Front

What is the area of a circle with a radius of 3 cm?

Back

28.27 cm² (Area = π × 3²).

Front

What is the circumference of a circle with a diameter of 8 cm?

Back

25.13 cm (Circumference = π × Diameter).

Front

How do you convert diameter to radius?

Back

Divide the diameter by 2.

Front

What is the area of a circle with a diameter of 12 cm?

Back

113.10 cm² (Area = π × (6)²).