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Area of a Rectangle

Area of a Rectangle

The area of a rectangle is given by: `A = bh`

Area of a rectangle base x height

where A is the area, b = base length and h is the height.

A rectangle that is 8 units along its base length, and 4 units high, has an area of 32 units square.

Area of a rectange 8 x 4

Area units are squared: for example, a rectangle of 5 cm x 3 cm has an area of 15 cm2.

Example 1

What is the area of a rectangle with a base length of 15.5 cm and a height of 4 cm?

Area = base x height
= 15.5 x 4
= 62 cm2

Remember the answer is in cm2

Answer: 62 cm2

Example 2

One side of a rectangular building is completely covered in glass. The area of the glass is 550 m2. If the building is 55m long, how tall is the building?

Area = base x height
Substitute: 550 = 55 x h
Divide both sides by 55: 550 รท 55 = h
10 = h

Answer: 10m