Dont ignore, need ! use the law of sines/cosines to find..

16. Angle C is approximately 13.0 degrees.

17. The length of segment BC is approximately 45.0.

18. Angle B is approximately 26.0 degrees.

15. The length of segment DF "e" is approximately 12.9.

Step-by-step explanation:

By the law of sine, the sine of interior angles of a triangle are proportional to the length of the side opposite to that angle.

For triangle ABC:

.

.

.

Note that the inverse sine function here is also known as arcsin.

By the law of cosine,

,

where

For triangle ABC:

Therefore, replace C in the equation with A, and the law of cosine will become:

.

.

For triangle ABC:

Start by finding the cosine of angle B. Apply the law of cosine.

.

.

.

For triangle DEF:

Apply the law of sine:

.

180

step-by-step explanation:

12-2=10

20-2=18

18x10=180