Circumference and Area Of A Circle Practice

Front

What is the formula for the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × radius.

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Front

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

Back

The radius is 5 m (radius = diameter / 2).

Front

How do you calculate the area of a circle?

Back

Area = π × radius².

Front

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

Back

Circumference = 2 × π × 7 = 43.96 m.

Front

If a circle has a diameter of 12 m, what is its circumference?

Back

Circumference = π × 12 = 37.68 m.

Front

What is the radius of a circle with a circumference of 31.4 m?

Back

Radius = Circumference / (2 × π) = 5 m.

Front

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

Back

Area = π × 3² = 28.26 m².

Front

If the radius of a circle is doubled, how does the circumference change?

Back

The circumference also doubles.

Front

What is the diameter of a circle with a radius of 4 m?

Back

Diameter = 2 × radius = 8 m.