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Angles and angle measures Vertically opposed angle, stages and alternate angles, ... [Home] [Search] [Forum] [Links] [Contact] [Imprint] [Sitemap]
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Between the two half straight lines a and b are two angles. The S point is the vertically opposed angle and the two half straight lines are called the limbs of the angle. Instead of coloring the angle, we can mark it with Greek letters. Usually we only need the first five of the alphabet, some times even less. The first five letters are: Alpha (which corresponds to the English letter a), Beta (which corresponds to the English letter b), Gamma (which corresponds to the English letter g), Delta (which corresponds to the English letter d), Epsilon (which corresponds to the English letter e). The size of an angle is indicated and measured by the unit of degrees. There for, the units angle has the measurement of 1o.
Vertically opposed angle
The angles α and α’ lie on two crossing straights opposite of each other. They are called vertically opposed angles and are respectively alike.
Stages angles and alternate angles
The angles α and α’ lie on a straight, that is crossed twice by two other straights that are parallel to each other. We call these angles stages angles. These angles have the quality of being the same size.
The vertically opposed angle on a stages angle is called alternate angle and logically has the quality of also being respectively the same size. The angles α and α’ are consequently the same size in this shape.
Types of anglesThere are following types of angles (shown with their properties)
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