**MACHINE SHOP CALCULATION - OD1640 - LESSON 2/TASK 3**

14.

Law of Tangents

When the sides of a triangle are expressed in several figures, it is more

efficient to use the following formula:

which is known as the "law of tangents"; a and b are any two sides.

A and B

are the angles opposite those sides.

EXAMPLE

Find angles A and B in figure 28, view A (on the following page) using the

Law of tangents.

**90**