Pearson Geometry Common Core, 2011
PG
Pearson Geometry Common Core, 2011 View details
1. The Pythagorean Theorem and Its Converse
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Exercise 13 Page 495

No, see solution.

Practice makes perfect
We are given the set of three numbers, and want to determine whether they form a Pythagorean triple. Therefore, we have to check if a triangle with the given lengths of sides is a right triangle. We will need to use the Converse of the Pythagorean Theorem.

Converse of the Pythagorean Theorem

If the sides of a triangle have lengths a, b, and c, and c^2=a^2+b^2, then the triangle is a right triangle.

This tells us that we can use the Pythagorean Theorem in reverse to test if a triangle is right. In general, the hypotenuse c has the greatest value. Let's substitute a=4, b=5, and c=6 into a^2+b^2=c^2, and see if they produce a true statement.
a^2+b^2=c^2
4^2+ 5^2? = 6^2
16+25 ? =36
41≠ 36
The values produce a false statement, so the described triangle is not a right triangle and, as a result, the given set of numbers is not a Pythagorean triple.