The height of a triangle is 18 inches. What is the length of the base if the area of the triangle is 63 square inches?

2 Answers
Dec 17, 2015

The height is 7 inches long

Explanation:

We know that, for any triangle with base b and height h is given by A=(b * h)/2

If the area and the height are known, the base is given by

A=(b * h)/2 \to 2A=b*h \to (2A)/h = b

So, simply substitute your values to have

(2*63)/18 = 63/9 = 7

Jan 21, 2016

ar of triangle = 1/2*b*h

Explanation:

So we have,
h=18 inches.
ar=63 square inches.
b=?

Sol. ar of triangle= 1/2*b*h

Therefore, 63= 1/2*b*18
(So, we know that 2x9=18)
Therefore, we have 63= b*9
so, b=63/9
Therefore b= 7 inches

Ans. The base of the triangle is 7 inches.