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.
Definition: Two angles that add up to 180Â°. Try this Drag an orange dot. The two angles will change so that they always add to 180Â°. In the figure above, the two angles â PQR and â JKL are supplementary because they always add to 180Â°. Often the two angles are adjacent, in which case they form a linear pair like this: Similar in concept are complementary angles, which add up to 90Â°.