AREA OF A CIRCLE

Front

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

Back

Area = π × r², where r is the radius.

Front

What does the term 'diameter' mean in relation to a circle?

Back

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

Front

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

Back

Area = π × (5 cm)² = 78.5 cm² (using π ≈ 3.14).

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius (d = 2r).

Front

What units are used to measure area?

Back

Area is measured in square units (e.g., cm², m²).

Front

How do you find the radius if you know the diameter?

Back

Radius = Diameter ÷ 2.

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 cm, what is the radius?

Back

Radius = Diameter ÷ 2 = 10 cm ÷ 2 = 5 cm.

Front

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

Back

Area = π × (7 cm)² = 153.86 cm² (using π ≈ 3.14).

Front

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

Back

Circumference = π × d, where d is the diameter.