Question

what is the sum of all three angles of triangle

Answer 1

the sum of all three angles of a triangle is 180degree

Answer 2

hey mate here is your answer....... :-)
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the sum of three angles of a triangle is 180.

why the sum of the three angles of a triangle is 180?

answer :- step 1 :- Take pencil and paper.

step 2 :- Draw a triangle ABC with base AB and top C.

step 3 :- Now draw the line parallel to the base through C. The left outer angle of C is equal to the left inner angle ∠CAB.∠CAB. 

This is a theorem about angles of two parallel lines intersected by a third. The right outer angle of C is equal to the right inner angle 
∠CBA and because ∠ACB is obviously equal to itself and a straight angle is 180 .

thus proved..
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