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. But a screwdriver is not a striking tool, and using it that way can damage it. Instead, Ron recommends using a standard cold chisel.
Complementary angles - Two angles are complementary if they add up to 90Â°. Corresponding angles - When two lines (usually parallel) are crossed by another (called the transversal) the angles in the same corners of each line are called corresponding angles.
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°.