Line segment JL is an altitude in triangle JKM. Triangle K J M is shown. Angle K J M is a right angle. An altitude is drawn from point J to point L on side K M to form a right angle. The length of K J is 13, the length of J L is 5, and the length of J M is 8. Which statement explains whether JKM is a right triangle? Round measures to the nearest tenth. JKM is a right triangle because KM = 15. 3. JKM is a right triangle because KM = 18. 2. JKM is not a right triangle because KM ≠ 15. 3. JKM is not a right triangle because KM ≠ 18. 2.