Answers

2015-08-08T20:34:30+05:30
WE KNOW THAT ANGLE SUM PROPERTY OF A TRIANGLE IS 180 DEGREES
SO TWO TRIANGLES 180+180=360

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2015-08-08T21:03:44+05:30
We know that triangle*2=quadrilateral.
Here's a way.

Draw a quadrilateral ABCD. Make it a square. Draw a circle around it. You will se the quadrilateral will be fully travelled. 

This means all four angles of a quad will add to 360*.

Therefore two triangles' angles will add to 360*.
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