Question

if one angle of a triangle is equal to the same of the other two show that the triangle is right angle

Answer 1

Let the first angle and second angle be a and b respectively

Third angle = a + b

Now,

a + b + a + b = 180
=> 2a +2b = 180
=> 2(a+b) = 180
=> a+b = 90 degree

Third angle = 90 degree

So, It is a right angled triangle


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Answer 2

answer in the photo
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