Circles & Composite Figures Version 2

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.

Front

What is the diameter of a circle?

Back

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

Front

What is a composite figure?

Back

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

Front

How do you find the area of a composite figure?

Back

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

Front

What is the relationship between the radius and diameter of a circle?

Back

The radius is half the diameter.

Front

If a circle has a radius of 5 inches, what is its area?

Back

Area = π(5)² = 25π ≈ 78.5 square inches.

Front

If a circle has a diameter of 10 inches, what is its circumference?

Back

Circumference = πd = π(10) ≈ 31.4 inches.

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

How do you convert the radius to diameter?

Back

Multiply the radius by 2.