It may be necessary to use Pythagoras' theorem and trigonometry to solve a problem ... Draw the right-angled triangle AFC and label the sides. The angle between AF and the plane is \(x\).

CLIMBER:'The angle within the triangle will be equal to 140 degrees ... The video clip shows the scene of a hiker who applies Trigonometry to solve height and distance problems.

There he wrote an encyclopedic textbook series, “Éléments de mathématique,” that sought to revise the foundations of ...