A triangle contains a right angle, and one of its other angles measures 35 degrees. Enter the number of degrees in its third angle.

الشرح

A right angle contributes a full 90 degrees to the triangle total of 180, so the third angle is 180 minus 90 minus 35, which is 55. Entering 145 leaves the right angle out of the sum altogether and subtracts only the smaller stated angle.