Area and Circumference

Front

What is Pi?

Back

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

Front

What fraction represents Pi?

Back

22/7

Front

What is the formula for the circumference of a circle?

Back

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

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Front

What is the diameter of a circle?

Back

The diameter is the distance across the circle through its center, equal to twice the radius.

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

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

Back

Circumference = 2 × π × 5 cm ≈ 31.4 cm.

Front

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

Back

Area = π × (5 cm)² ≈ 78.5 cm².

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the radius (Diameter = 2 × Radius).

Front

What is the approximate value of π?

Back

Approximately 3.14.