Question

the area of a triangle is 90 cm if base if is 15 cm find its altitude

Answer 1

area =90
base =15
alt = x
area of triangle=1/2×base×alt
90=1/2×15×x
90=7.5x
x=90÷7.5
x=12
altitude=12

Answer 2

Area of triangle = 1/2×b×h
90 cm = 1/2×5cm ×h
h = 90×2/15
h = 6 × 2cm
h = 12 cm