## Elementary Geometry for College Students (7th Edition) Clone

To measure the value of r, We need to use the law of cosines Since the sides of the triangle is given. They are Pythagorean triplet $c^{2}$ = $a^{2}$ +$b^{2}$ $5^{2}$ = $3^{2}$ +$4^{2}$ 25 = 9 + 16 25 = 25