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.
Finding the measure of complementary angles:In this example, students will use algebra to find the measure of two angles whose sum equals 90 degrees, better known as complementary angles. Introduction to Vertical Angles:This video uses facts about supplementary and adjacent angles to introduce vertical angles.