Area of a trapezoid

Area A =
(b1 + b2) x h / 2

DA = base 1 = b1
CB = base 2 = b2
h = height

Example

ABCD is a trapezoid with a base b1 = 4 cm, a base b2 = 8 cm and a height h = 3 cm
Area A of a trapezoid ABCD =
(b1 + b2) x h / 2
=
(4 + 8) x 3 / 2
=
12 x 3 / 2
= 18 cm²

Calculate the area of a trapezoid

Base 1 b1
Base 2 b2
Height h
Area of the trapezoid