Question

Is the triangle with the given side lengths a right triangle? EXPLAIN how you know.

3.9 mm, 8.0 mm, 8.9 mm

Answer 1

It is a right triangle

Explanation:

Use the Pythagorean theorem:

`a^2+b^2=c^2\\\\3.9^2+8.0^2=8.9^2\\\\15.21+64=79.21\\\\79.21=79.21`

if they weren't equal, it wouldn't be a right triangle.