## Basic College Mathematics (9th Edition)

Hypotenuse $\approx 12.2$ km.
Let $H =$ hypotenuse of the triangle $a^{2} + b^{2} = c^{2}$ $7^{2} + 10^{2} = H^{2}$ $49 + 100 = H^{2}$ $149 = H^{2}$ $H = \sqrt 149$ $H = 12.206...$ $H \approx 12.2$ km