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.
By Deb Russell. Definition: As shown in the image, the two parallel lines are both intersected by another line. The alternate angle 1 and angle 4 will share the same measure of degrees. Likewise angle 2 and angle 3 are alternate angles and share the same measure of degrees. The alternate angles in the image are both interior angles. The same will hold true for exterior angles. Alternate angles are equal. Examples: In geometry, two angles that lie on opposite sides and at opposite ends of a line that goes through two or more lines on the same plane (transversal).