1. Converse to the Pythagorean Theorem
Ch 7.2

2. Converse to the Pythagorean Theorem
If the square of the length of the longest side of a triangle is equal to the sum of the squares of the lengths of the 2 other sides, then the triangle is a right triangle.

3. Verifying that something is or is not a right triangle.
1. First we determine which side would be the hypotenuse.
2. Second we plug the values into the Pythagorean theorem.
Yes, we have a right triangle!

4. Is it a right triangle?

5. Theorem 7.3

6. Theorem 7.4

7. Classify the triangle as right, obtuse or acute.
15, 20, 25
9, 10, 15
right
625 = 625
SO ACUTE
181 < 225
8, 9, 10
145 > 100