Atriangle has side lengths of 80 cm 39 cm 89 cm is the triangle acute, obtuse, or right?

We can classify the triangle to be right ,acute or obtuse with respect to their sides . c is the longest sides .For any triangle with sides a,b,c if

1) the triangle is a right triangle .

2) the triangle is obtuse.

3)

Given triangle has side lengths of 80 cm ,39 cm,89 cm . 89 cm is the largest side or c= 89 cm.

6400+1521 = 7921

7921=7921

The given triangle is a right triangle.

answer: x=60