first we draw a triangle than we mark3angle of triangle. now think that which no. comes in all 3 angle of triangle that equals to 180 degrees because the sum of 3angles are 180 degr ees.
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Cut out any 4 sided straight lined shape and the 4 interior angles will always add up to 360 degrees.
make a v shape
The 4 interior angles of any quadrilateral add up to 360 degrees
A quadrilateral is a polygon with 4 sides... so if it has 4 sides it is a quadrilateral. your question doesnt make sense because a 4 sided quadrilateral could be any quadrilateral at all.
Any polygon with 4 sides is a quadrilateral