What is vertically opposite angles; angle sum property and linear pair of angle??
Answer:
When lines intersect they form two pairs of equal vertically opposite angles
$\angle$1 = $\angle$ 2 (vert opp angles)
L3 = L 4 (vert opp angles)
They also form four pairs of linear pairs of angles.
$\angle$1, $\angle$3; $\angle$1 $\angle$4; $\angle$2,$\angle$3; $\angle$2, $\angle$4
Linear pair of angles form a straight angle i.e., 180 degrees
In a triangle ABC
sum of angles $\angle A + \angle B + \angle$C = 180 degrees
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