7th Final - Area of a Circle, Circumference & Compound Area

Front

What does 'circumference' mean?

Back

Distance around a circle.

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where C is circumference and r is the radius.

Front

What is the area of a circle?

Back

A = πr², where A is area and r is the radius.

Front

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

Back

r = C / (2π).

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius (d = 2r).

Front

What is a composite figure?

Back

A shape made up of two or more simple shapes.

Front

How do you find the area of a composite figure?

Back

Calculate the area of each simple shape and add them together.

Front

What is the formula for the area of a rectangle?

Back

A = length × width.

Front

What is the formula for the area of a triangle?

Back

A = 1/2 × base × height.

Front

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

Back

A = π(5)² = 25π ≈ 78.5 cm².