44.1 would be your answer
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To determine to measure of the unknown angle, be sure to use the total sum of 180°. If two angles are given, add them together and then subtract from 180°. If two angles are the same and unknown, subtract the known angle from 180° and then divide by 2.
No it is impossible because 9x7=63
Perpendicular lines are lines that cross at a 90 degree angle
Lines AB and BC