Area of Circles and Composite Figures

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

Front

What is the difference between diameter and radius?

Back

Diameter is twice the length of the radius. Radius is half the diameter.

Front

How do you find the area of a rectangle?

Back

Area = length × width.

Front

What is a composite figure?

Back

A composite figure is a shape made up of two or more simple shapes.

Front

How do you calculate the area of a composite figure?

Back

Find the area of each simple shape and then add them together.

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

If the radius of a circle is 3 cm, what is its area?

Back

Area = π × (3 cm)² ≈ 28.26 cm².

Front

What is the area of a circle with a diameter of 10 cm?

Back

Radius = 5 cm; Area = π × (5 cm)² ≈ 78.54 cm².

Front

How do you find the area of a shaded region in a composite figure?

Back

Subtract the area of the unshaded part from the total area.

Front

What is the area of a rectangle with a length of 5 cm and a width of 3 cm?

Back

Area = 5 cm × 3 cm = 15 cm².