Verify the sum of the angles of triangle is 180 degree

1.	Verify the sum of the angles of triangle is 180 degree
Answer» Given = ABC is a ∆ To prove : angle A + B + C = 180°Construction: draw a line l parallel to BC through A Proof : L \|\| BC &AB & AC are transversal angle1 =angle b alt.interior angles Angle 3= angle C alt.interior angles Angle 1+2+3 =180° by linear pair .Angle B + A + C = 180°

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