# Chapter 10 - Quadratic Equations - 10.1 - Quadratic Equations - Problem Set 10.1 - Page 443: 77

#### Work Step by Step

This is an isosceles triangle. Recall, for an isosceles triangle, a is equal to b, and c is equal to $a\sqrt{2}$ (which is the same as $b\sqrt{2}$).

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