Answer:
Right angle 90 degrees is always going to be a right angle.
Step-by-step explanation:
Answer:
C) 
Step-by-step explanation:

Therefore, C is correct. Recall that 
Answer:

Step-by-step explanation:
Given



Required
Solve for x
Since B is in between both points, then:

This gives


Divide by 3

If its 21 inches then rounding to the nearest who should be 21 inches