HK consists of two part, HJ and JK
HK = HJ + JK
We know that:
HK = 12.2ft
JK = 3.1ft
HJ = ?
Let's plug our values into the equation above.
12.2ft = HJ + 3.1ft
Subtract 3.1ft from both sides.
9.1ft = HJ
Answer:
Point X
Step-by-step explanation:
If you look, you can see that X is the center point for both TRAP and T'R'A'P'. I also just took the test myself and got it correct.
Hope this helps!