when two straight lines intersect with each other than vertically opposite angles will be equal .
AB and CD are two line segment and point E is called point of intersection where two lines intersect each other at a point.[br].angle CED and angle AEB are also called linear pair because sum of angle CEA and angle AED is 180 degree[br].we can see that vertically opposite angles are equal.
[br]how many points of intersection are their in figure
what is sum of linear pair?
How many angles are there in this given figure?
Which angles will be equal ?
What is the sum of angels in linear pair