Dear!
In my best knowledge,your ans is b.
Not sure why such an old question is showing up on my feed...
Anyway, let

and

. Then we want to find the exact value of

.
Use the angle difference identity:

and right away we find

. By the Pythagorean theorem, we also find

. (Actually, this could potentially be negative, but let's assume all angles are in the first quadrant for convenience.)
Meanwhile, if

, then (by Pythagorean theorem)

, so

. And from this,

.
So,
Answer:
5/4,2.5,3.7,4.75,5.5,6,28,29
Step-by-step explanation:
78’ degrees on the right side
Answer:
2000
Step-by-step explanation:
2(20x30)+ 2(8x30) + 2(20x8).