Let's say you have two angles, each one is 45 degree. If you add them up and the sum is 90 degree then those angles are Complementary angles.

Consider few more examples

70 degree and 20 degree

35 degree and 55 degree

10 degree and 80 degree

all above are Complementary angles as the sum of both is equal to 90 degree or right angle.

Consider few more examples

70 degree and 20 degree

35 degree and 55 degree

10 degree and 80 degree

all above are Complementary angles as the sum of both is equal to 90 degree or right angle.

What are Complementary Angles - 7th Grade Math

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