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Area of a trapezoid

Area of a trapezoid is calculated by multiplying the height by the sum of its bases then divide everything by 2.

Area of a trapezoid

A trapezoid has 2 of its opposite sides parallel. The parallel sides are called bases. One base is longer than the other. Both bases are perpendicular on the height.

A = [(b1 + b2) × h] ÷ 2

Where A is the area, b1 is the longer base, b2 is the shorter base, and h is the height.

Example:
If: b1 = 7; b2 = 5; h = 3
Then A = ?

A = [(b1 + b2) × h] ÷ 2 = [(7 + 5) × 3] ÷ 2 = (12 × 3) ÷ 2 = 36 ÷ 2 = 18 square units