Question

Area of a trapezoid: 9 m by 15m by 20m

Answer 1

A=1/2 9+20×15
1/2. 29×15

217.5

Answer 2

Equation: 
$A = \frac{a + b}{2}h$

a (base) = 9
b (base) = 20
h (height) = 15

$A = \frac{9 + 20}{2}15$

$A = \frac{29}{2}15$

$A = 14.5 * 15$

$A = 217.5$

The area of the trapezoid is 217.5 m.