Rectangles

Front

What is a rectangle?

Back

A rectangle is a quadrilateral with four right angles and opposite sides that are equal in length.

Front

What is the formula for the area of a rectangle?

Back

Area = length × width.

Front

What is the formula for the perimeter of a rectangle?

Back

Perimeter = 2(length + width).

Front

If the length of a rectangle is 10 cm and the width is 5 cm, what is the area?

Back

Area = 10 cm × 5 cm = 50 cm².

Front

If the length of a rectangle is 8 cm and the width is 3 cm, what is the perimeter?

Back

Perimeter = 2(8 cm + 3 cm) = 22 cm.

Front

What are the properties of the diagonals of a rectangle?

Back

The diagonals of a rectangle are equal in length and bisect each other.

Front

If DE = 4x + 1 and EB = 12x - 31, what is the value of x when CD = 28?

Back

x = 5.

Front

What is the measure of angle ADE in a rectangle?

Back

Angle ADE = 90 degrees.

Front

How do you find the length of a side of a rectangle if you know the area and the length of the other side?

Back

Length of the unknown side = Area ÷ known side length.

Front

What is the relationship between the angles in a rectangle?

Back

All angles in a rectangle are right angles (90 degrees).