Answer:

Step-by-step explanation:
If a, b and c are the lengths of the triangle's sides, then

Since
then

Thus,

Answer:
last option
Step-by-step explanation:
It converts sin, π and cos.
The answer is the last option.
Answer:
Step-by-step explanation:
Two angles form a linear pair.
The measure of one angle is 3.5 times the measure of the other angle.
Find the measure of each angle.
The measure of one angle is 180º/4.5 or 40º
The measure of the other angle is 140º