Circles (Area, Circumference, Radius, and Diameter)

Front

What is the space that a circle covers called?

Back

Area

Front

What is the formula for the area of a circle?

Back

Area = π × radius²

Front

What is the distance from the center of a circle to any point on its circumference called?

Back

Radius

Front

What is the diameter of a circle?

Back

The diameter is twice the radius.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × radius

Front

If the radius of a circle is 5 cm, what is the circumference?

Back

Circumference = 2 × π × 5 cm = 31.42 cm (approximately).

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.

Front

How do you calculate the area of a circle if you know the diameter?

Back

Area = π × (diameter/2)².

Front

What is the circumference of a circle with a radius of 10 mm?

Back

Circumference = 2 × π × 10 mm = 62.83 mm (approximately).

Front

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

Back

Area = π × (3 cm)² = 28.27 cm² (approximately).