One angle is of course 90o, the other two make up the remaining 90o in any combination.
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a right angled triangle with the remaining angles both being 45 degrees will be a rightangled triangle and an isosceles triangle.
I quote " The square on the hypotenuse of a rightangled triangle..."
There are 180 degrees in every plane triangle.
there are 180 degrees in a triangle all together
Each triangle has 180 degrees on the inside angles.