What is an Angle Pair

Angular pairs: Type & Concept

Five main kinds of angle pair exist in geometrie. Over the course of this tutorial, you will investigate the different kinds of angle and how to measure them. Which kinds of angle couples are there? This angle is very well visible, because you can make an "L" form out of the two angle couples.

The reason for this is that when added, complimentary angels make a right angle or 90 degree. The first figure shows the complement between angle ABC and angle CBD. As you can see from the second sentence of angle, angels can complement each other even if they are not directly adjacent.

The second figure shows the angle ABE 45 degree and the angle CBD 45 degree, and together they result in 90 degree, which means that they complement each other. So long as their readings sum up to 90 degree, they are complimentary angle pair. A linear pair is an angle that forms a line.

The two of them divide a point and the line (or ray) they do not divide forms a line. Additional angle are angle that adds up to 180 degree. An angle of 180 degree looks like a line. The figure above shows that additional angle can be either rectilinear or non-linear angle pair.

Like mentioned before, rectilinear couples of additional squares are joined at a point to create a rectilinear line. With nonlinear couples the corners sum up to 180 degree, but are not linearly united. Now use a Compass to take measurements of each of the four corners in this "X" series.

Remeasure the angle. Opposite corners should have the same dimension. Those corners are referred to as verticals, and one of their characteristics is that they are matched, which means that no matter how much you move the "X" around, the corners will always have the same degree of opposite each other.

ACB and ECB are perpendicular and therefore matching corners in the above example. Adjoining corners are essentially corners that lie directly next to each other. Adjoining corners are not necessarily coincident, they only lie next to each other.