If one of a triangle is equal to the sum to other two show the traingle is a right triangle
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let two angles be x and y
therefore the other angle=x+y
according to angle sum property
sum of the angles of triangle =180
(x+y)+x+y=180
x+y=90
therefore the other angle=x+y
according to angle sum property
sum of the angles of triangle =180
(x+y)+x+y=180
x+y=90
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