10. 1⁄2 (a + b) — 11⁄2 (a — b).

Multiplication of a Binomial multiply a binomial by a monon term of the binomial by the m it the proper sign.

Stated in words this rule is: To a given arc draw in a chord and

2

segment thus formed.

FIG. 118.

The diam

square of one-half the length of ch the height of segment all divided by To apply this rule in finding the d pulley shown in Fig. 118, the leng ures 4 in. and the height of segm Using the rule the diameter