Math angles 4 - Joshua Tree 12-29-12 Dr. MP RenfrewMath angles 1 - Joshua Tree 12-29-12 Dr. MP RenfrewDSC05265Math angles 3 - Joshua Tree 12-29-12 Dr. MP Renfrew
Math angles 5 - Joshua Tree 12-29-12 Dr. MP Renfrew
Math angles 6, Cholla - Joshua Tree 12-29-12 Dr. MP Renfrew
Ridges & canyons are inverse angles
Joshua Tree National Park