If three angles of a quadrilateral are equal and the fourth angle is a right angle is a right angle, then find the three angles of the quadrilateral.
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Let the 3 angles be x so we know Sum of angles in a quadrilateral is 360 so, as one angle is 90 then,
x+x+x+90=360
3x=360-90
3x=270
x=270/3
x=90
x+x+x+90=360
3x=360-90
3x=270
x=270/3
x=90
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