Answer:
LK = 50°
Explanation:
the measure of a chord- chord angle is half the sum of the measures of the arcs intercepted by the angle and its vertical angle , then
(JM + LK) = 62° ( multiply both sides by 2 to clear the fraction )
JM + LK = 124°
74° + LK = 124° ( subtract 74° from both sides )
LK = 50°