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We want to know how many degrees the ? stands for in this
triangle, which is drawn to scale:
We know that the three angles in EVERY triangle has sum 180°.
So we add the two angles that we are given:
63°+12° = 75°
Then we subtract from 180°:
180°-75° = 105°
We get that the third angle is 105°, and now we can
complete our drawing:
Edwin