Question

Find the length of the third side. Round if necessary

Answer 1

Given:

The right angled triangle ABC,

Length of side AB=7

Length of side AC=8

Objective is to find length of side BC.

By using pythagorean thorem,

`\begin{gathered} AC^2=AB^2+BC^2 \\ 8^2=7^2+BC^2 \\ BC^2=8^2-7^2 \\ BC^2=15 \\ \text{taking square root on both side,} \\ BC=\sqrt[]{15} \\ BC=3.9 \end{gathered}`

Answer: the length of 3rd side BC=3.9