This math topic focuses on understanding how to find the measure of an angle that complements another given angle to make a total of 90 degrees. It is part of a broader unit on geometry that involves studying intersecting, parallel, and perpendicular lines. The questions present various scenarios where an angle less than 90 degrees is given, and the student is asked to find the measure of the remaining angle to complete the 90-degree angle. Students are required to perform subtraction from 90 degrees to solve the problems, thereby enhancing their skills in basic angle arithmetic and their understanding of complementary angles.
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A 90º angle is made up of a 70º angle and another angle. How many degrees is the other angle?