What should we find...
Probably base and the height...
Area = 1440cm²
base = 5×height
base = 5h
Area of triangle = base × height
1440 = 1/2 × 5h × h
1440 = 5h²/2
5h² = 2880
h² = 2880/5
h² = 576
h=24cm..
Height = 24cm
Since base = 5h
Base = 5×24
Base = 120cm...
Hope this helped....
Base =