Viewing in Doors & Windows. Many people use a screwdriver to remove a hinge pin when taking off a door. They simply place the tip up under the head of the pin and then tap on the end with a hammer.
Complementary angles are two angles whose measures add up to 90 degrees. You can think of them as two puzzle pieces that form one 90 degree angle when they are put together. When talking about complementary angles, it's important to remember that they're always in a pair.
Get a Tutor. Definition: Any two angles are called Complementary angles when they add up to 90Â°. When two angles add to 90Â°, we say that the angles are âComplementâ to each other. In the pair of Complementary angles if one angle is xÂ°, then its Complement is an angle of (90 - x)Â° . From the above figures, we have $\angle$ABD and $\angle$DBC are complementary because 30Â° + 60Â° = 90Â°. $\angle$FGH and $\angle$IJK are complementary because 40.2Â° + 49.8Â° = 90Â°.