In this article we will cover the topics of “Types of angles” and “Angle at intersection of lines”.
An angle is formed when two lines meet at a point or cross each other. When 2 lines meet normally 2 angles are formed internal and exterior angle. When 2 lines cross each other normally 4 angles are formed and 2 pairs are vertically opposite each other.
In the diagram : Angle at Intersection : angle b = d is equal, a = c is equal
Also sum of all the angles at the point : a + b + c + d = 360o
The angles formed when a transverse line cuts two parallel line.
1. The corresponding angles are congruent. a = e, b = f, d = h, e = g.
2. Alternate angles are congruent , g = d, h = c,
3. Interior angles on the same side are supplementary – h+d = g + c = 180o
4. The sum of opposite internal angles is h +c = g + d = 180o
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