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It is 310 degrees.
The sum of the four angles is 360 degrees. Three of the angles add up to 310 so the fourth must be 360 - 310 = 50 degrees.
360 degrees = 100% so divide the angle's measure, in degrees, by 3.6.360 degrees = 100% so divide the angle's measure, in degrees, by 3.6.360 degrees = 100% so divide the angle's measure, in degrees, by 3.6.360 degrees = 100% so divide the angle's measure, in degrees, by 3.6.
The measure of JIL is the sum of IJK and KJL, so it is 15 + 13 = 28 degrees.
90 degrees is the measure of a right angle