Explanation:
The measure of an inscribed- in - a - circle angle is 1/2 of its intercepted arc
sooooo 1/2 * (16x-26 ) =5x+ 11
8x - 13 = 5x+11
3x = 24
x = 8
16x-26 = 102 degrees =arc
5x+11 = 51 degrees= mABC
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