Intersection of two lines

Objectives

To verify vertically opposite angles are equal

Estimated Time

20 minutes

Prerequisites/Instructions, prior preparations, if any

Knowledge about point, line, angle

Materials/ Resources needed

Digital: Click here to open the file

Non-digital: Paper, pencil, ruler, compass, protractor

Process (How to do the activity)

Download this geogebra file from this link.

Procedure :

1. What are intersecting lines?
2. Identify two lines cross each other in a plane i.e. lines 'g' and 'f' intersect at point 'A'
3. Identify intersecting lines (two or more) meet only at one point always and also can cross each other at common vertex (which is the point of intersection).
4. Identify the angles formed at common vertex 'A'
5. Identify two pairs of opposite angles
6. What is the vertically opposite angle?how many pair of vertically opposite angles are formed?
7. Identify and measure vertically opposite angles?What is your conclusion?
8. Can vertically opposite angles be adjacent?
9. How many pairs of adjacent angles are formed?
10. Idenify and measure adjacent angles?What is your conclusion?

Evaluation at the end of the activity

1. Can two lines cross at two points?
2. If out of two angles of linear pair one is 60°, then what is the measure of other angle?
3. If two angles are vertically opposite angles, where the measure of one of the angles is 30°, then what is the measure of other angle?

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