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When two or more lines cross each other in a plane, they are called intersecting lines. The intersecting lines share a common point, which exists on all the intersecting lines, and is called the point of intersection. Here, lines P and Q intersect at point O, which is the point of intersection. In the given image below, there are many straight lines crossing each other and intersecting at the common point P. Properties of intersecting lines
Here, ∠a and ∠c are vertical angles and are equal. Also, ∠b and ∠d are vertical angles and equal to each other. ∠a + ∠d = straight angle = 180° Intersecting lines in real life
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