Question

Pleasssssssssssssssse
explain main concepts of Quadrilaterals, for class 9
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Answer 1

in a quadrilateral, sum of all interior angles is 360 degree,
sum of two consecutive interior angles is 180 degree,
diagonal intersect each other etc.

Answer 2

Answer:

Main concepts of quadrilateral is that a quadrilateral is an enclosed shape on a plane with four straight line sides connected at four vertices or corners without any side crossing any other.

Sum of its interior four sides is 360 .