Question

find the area of a triangle having:
1) base=18cm , height =12cm
2)base=7.2m , height=7dm

Answer 1

1. Area of triangle = 1/2 * Base * height
                              = 1/2 * 18 * 12
                              = 108 cm sq
2. Area of triangle = 1/2 * 72 * 7              1m=10dm   7.2m = 72 dm
                              = 252 dm sq

Answer 2

$\frac{1}{2} \times bas e \times \: height \\ \frac{1}{2} \times 18 \times 12 \\ = 108$