Answer: The equation doesn't look right, it's either there's too many symbols or you need to switch some things around.
Step-by-step explanation:
Answer:
See below
Step-by-step explanation:
We want to prove that

Taking the RHS, note

Remember that

Therefore,

Once

Then,

Hence, it is proved
Answer:
The answer is 21
Step-by-step explanation:
This should help you
Yes there is. i do not know the theorem but I know it's rule. If 2 lines intersect the same line, and they have an equal angle in the same quadrant then they are parallel. This is because their all of their angles would be equal and they are basically the same line but shifted over