b.

When two angles and the included side are given (figure 28, view B, on

the following page), the area can be obtained from the following formula:

Substituting in the formula given in 15a, above, the following is obtained:

c.

When three sides are given, the following formula is used where a, b,

and c are the three sides and A = 1/2 (a + b + c), then

16.

Conclusion

This lesson served to describe the processes for converting linear

measurements from the English to metric system and from the metric to the

English system, and for solving problems using ratio, proportion, and

trigonometry. These mathematical

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