15.

Area of Triangles

a.

The area of a triangle is expressed by the formula A (area) = 1/2bh,

when b is the base and h is the altitude. When two sides and included angle

are given (figure 28, view B), the area can be obtained from the following

formula, where h and a are the sides and C is the angle:

Thus, the area of the triangle may be written:

FIGURE 28.

FIND ANGLES AND AREA OF TRIANGLES.