4.4 Solving Problems Using Obtuse Triangles

Today we continued using Sine and Cosine laws. We also solved problems that can be modelled by one or more obtuse triangles.
        Example. a surveyor in a helicopter wants to know the width of Garibaldi Lake. He starts 1610m above the forest and observes the angles of depression to both ends measuring 45 degrees and 82 degrees.

He the figured out the angles in the triangle to be 45 degrees 37 degrees and 98 degrees then used the right triangle it made with the trees and found the far distance to the lake and it was 2237.9m
using sine law he found the lake to be 1384m in width.

Summary of the Process for Solving Triangles

We were assigned pg. 193-197

The Solving Triangles Assignment is due Thursday Nov.3 Remember not to do # 4,8

Next to go is Alexander ! :)