Question

A triangle has an area of 90 cm². Find the length of the base if the base is
3 cm more than heights​

Answer 1

Step-by-step explanation:

let the height of triangle=Xcm

base=(X+3)cm

area90sqcm

area =1/2 (X+3)X=90

Xsquare+3X=180

x*2+3x-180

x*2+15x-12x-180

x (x+15)-12 (x+15) =0

(x+15)(x-12) =0

x=12

height=15cm

base=x+3

15+3=18cm