Question

What is the length of the base of a triangle with height 20 cm and area 150 cm2?

Answer 1

Area = 1/2 b * h

150 = 1/2 * b * 20

b = 15cm

Answer 2

For a triangle: Area = .5*base*height

For you: Area = 150 and height = 20

Plugging those into the formula, you get 150=.5%2Abase%2A20
Multiply .5 and 20: 150=10%2Abase
To get base by itself, divide by 10 on both sides: 15=base

The base is 15 cm.