Not always because it could be a 50 50 80 triangle
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No because an isosceles triangle has various two congruent angles. A 45-45-90 triangle is technically an isosceles triangle.
If it is a 45° 45° 90° isosceles right triangle, then there are 2 sides that are perpendicular.
The question lists three facts: "triangle", "right", and "isosceles". Each fact carries important information. -- "triangle" ... The three angles in any triangle always add up to 180 degrees -- "right" ... One angle in a right triangle must be a right angle = 90 degrees. That leaves the other 90 degrees for the other two angles to share. -- "isosceles" ... Two of the angles in an isosceles triangle are equal. If there are 90 degrees to share between them, then each of them is 45 degrees.
These are the degrees of each angle. It is a right triangle, and it also is an isosceles triangle.
The two other angles are 45 degrees each. The three angles of every triangle always add up to 180 degrees. -- A right triangle is a triangle that has a right angle in it. -- A right angle is 90 degrees. -- That leaves 90 degrees for the other two angles in the right triangle. -- If it happens to be isosceles, then the other two angles are equal. -- Those must both be 45 degrees.