Given a triangle with vertices (0,0), (4,2), and (-1,5).

Question

 

To the nearest tenth of a degree, find the angles of the triangle, using right helper triangles and trig ratios.

Answer 1

Drop perpendiculars from (-1, 5) and (4, 2) to the x-axis.

Use Pythagoras to determine two sides of triangle.

Use the two sides of the triangle and the perpendiculars to determine the angles.