If three angles of a quadrilateral are 90 degree each, show that the given quadrilateral is a rectangle.
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we know sum of all angles of a quadrilateral is equal to 360degree
let 4th angle be X.
so,90+90+90+X=360
X=90 degree
a quadrilateral whose all angles =90degree is a rectangle
let 4th angle be X.
so,90+90+90+X=360
X=90 degree
a quadrilateral whose all angles =90degree is a rectangle
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