Mixed Review: 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

If the area of a circle is 246 in², how do you find the radius?

Back

Use the formula: r = √(Area/π). For 246 in², r ≈ 8.8 in.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × r, where r is the radius.

Front

What is the circumference of a circle with a radius of 5 inches?

Back

Circumference = 2 × π × 5 ≈ 31.4 cm.

Front

Define a composite figure.

Back

A composite figure is 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 then sum them up.

Front

What is the area of a rectangle with a length of 10 ft and a width of 5 ft?

Back

Area = length × width = 10 ft × 5 ft = 50 ft².

Front

What is the area of a triangle with a base of 6 ft and a height of 4 ft?

Back

Area = 1/2 × base × height = 1/2 × 6 ft × 4 ft = 12 ft².

Front

What is the total area of a composite figure made of a rectangle and a circle?

Back

Add the area of the rectangle to the area of the circle.

Front

What is the relationship between radius and diameter?

Back

Diameter = 2 × radius.