Complementary angles add up to a right angle (90°). So 90° - 25° = 65° The way I remember the difference between complementary and supplementary is: think of a Straight line is 180° (Supplementary). Think of a Cross makes a 90° angle (Complementary)
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78 degree angle
a 10-degree angle
66 degree angle
Complementary angles total 90°. The complement (or complementary angle) of 15° is 75° (90 - 15).
A pair of complementary angles add up to 90 degrees. Therefore, the complement of a 70 degree angle is 90 - 70 = 20 degrees.