Given that JI⊥KL and KH≅HL, find KI.
A. 3.9
B. 5
C. 7
D. 8

Answer:
D. 8
Step-by-step explanation:
The given information tells you that HI is the perpendicular bisector of KL, so triangles HIK and HIL are congruent. Then ...
KI = LI
3x -7 = x +3
2x = 10 . . . . . . add 7-x
x = 5
KI = 3x -7 = 3(5) -7
KI = 8