These are the degrees of each angle. It is a right triangle, and it also is an isosceles triangle.
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Triangles like 30,60,90 and 45 45 90 are standard triangles are standard.
Half of 90 = 45
135
You cannot. A right angled isosceles triangle will always be 90-45-45 so knowing the angles does not add any information. Without knowledge of any one side, you cannot distinguish between the infinitely many similar 90-45-45 triangles.
Because the total number of degrees in all triangle is equal to 180. Right triangles consist of one right angle(90) and two equal acute angles(45, 45).