What are angles


Two straight lines intersect at a point A. They form the acute angle α, i.e. alpha, which is 45 degrees.
With such set square you can measure and also draw angles.

When two straight lines intersect, they form angles at the intersection. The angle describes how the two straight lines relate to each other. The angles that arise can be very different. A particularly important angle is the right angle. In a rectangle, the neighboring sides always meet at a right angle. The angles belong in the school subject geometry.

However, angles can also be smaller than a right angle, in which case one speaks of acute angles. Angles that are larger than a right angle can be obtuse, straight, or obtuse angles. If the angle makes a whole circle, one speaks of a full angle.

Angles are measured in degrees. A whole circle has 360 °. You read 360 degrees. Half a circle is 180 degrees. A quarter of a whole circle is 90 degrees, which is a right angle.

Angles are measured with a set square or a so-called protractor. They are marked with an arc in a drawing. They are usually named with Greek letters. They are then called, for example, Alpha, Beta, Gamma or Delta.

Angles also play an important role in everyday life. In ships and airplanes, the exact direction in which one is moving is also given in degrees. When surveying the earth, angles are also very important. If you turn around yourself with the skateboard, you do a 360, that is, one turn of 360 degrees.

  • An acute angle is less than 90 degrees.

  • A right angle is exactly 90 degrees.

  • An obtuse angle is greater than 90 degrees but less than 180 degrees.

  • A straight angle is exactly 180 degrees.

  • An obtuse angle is greater than 180 degrees but less than 360 degrees.

  • A full angle is exactly 360 degrees.

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