Question

Find x for the trapezium.

Answer 1

$area \: of \: trapezium \: = \frac{a + b}{2} \times h \\ \\ area = 70 {cm}^{2} \\ \\ a = 11 \: cm \\ \\ b = 17 \: cm \\ \\ 70 = \frac{11 + 17}{2} \times x \\ \\ 140 = 28 \times x \\ \\ \frac{140}{28} = x \\ \\ 5 = x$