Question

The lengths of the sides of a triangle are given below. Classify the triangle as acute, obtuse, or right.

7, 9, 3

A. Acute Triangle


B. Obtuse Triangle


C. Right Triangle

Answer 1

• B. Obtuse Triangle

Explanation:

Use Pythagorean to identify if the triangle is right:

• 9² = 7² + 3²
• 81 = 58

We see the triangle is not right and the difference of the squares tells us the angle opposite to side with measure of 9 is greater than 90°.

It means the triangle is obtuse.

Correct choice is B