Appendix A - Review - A.2 Geometry Essentials - A.2 Assess Your Understanding - Page A19: 8

True

Let the lengths are $a=6, b=8$ and $c=10$. Use Pythagorean theorem $c^2=a^2+b^2$ where $c$ is the longest side. Substitute all the values. $(10)^2=6^2+8^2$ Simplify. $100=36+64$ $100=100$ Both sides are equal. Since the side lengths satisfy the Pythagorean formula, then the triangle is right. Hence, the given statement is true.