Let the first and second angle be a and b respectively
Third angle = a+b
By angle sum property of triangle
a +b + a+b = 180
=> 2a +2b = 180
=> 2(a+b) = 180
=> a+b = 90°
Third angle = 90°
-Answered by Himanshi Verma On 20 January 2019:05:07:15 PM
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