Question

Can one angle ina quadrilateral be 180 degree

Answer 1

A quadrilateral has 4 sides and 4 angles. The sum of the 4 angles is 360 degrees. If one angle is 180 degrees, the sum of the other three interior angles must be 180 degrees , which is impossible.

Again the sum of the exterior angles is 360 degrees. So if one interior angle is 180, the exterior angle will be its supplement and so 0 degrees. The sum of the remaining 3 exterior angles has to be 360 degrees, which is impossible.

So such a quadrilateral is impossible.

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