Question

The unknown side of a trapezium.

Answer 1

11 mm

Explanation:

121=area of a rectangle and area of triangle

121=x*8+(0.5)*x*(14-8), 11x=121, x=11

Answer 2

`11mm`

Explanation:

Let the unknown side be x

`Area \: \: \: of \: \: the \: \: trapezium = (1)/(2) * (sum \: \: of \: \: \: the \: \: parallel \: sides) * height \\ 121= (1)/(2) * (8 + 14) * x \\ 121 * 2 = 22x \\ 242 = 22x \\ (242)/(22) = (22x)/(22) \\ 11 = x`