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No, triangles cannot have more than one right angle. By definition, a right angle measures 90 degrees, and the sum of the interior angles of a triangle is always 180 degrees. Therefore, if one angle in a triangle is a right angle, the other two angles must add up to 90 degrees, making it impossible for the triangle to have more than one right angle.
Isosceles triangles are triangles in which 2 angles and 2 sides are congruent, or equal. There is nothing called an isosceles angle. Some isosceles triangles are right triangles. This is where the non-congruent triangle is a right triangle, and the other two are 45 degrees each. This type of triangle is called a 45-45-90 triangle. Two sides are multiples of one and the third is a multiple of root-2. In other words yes it is.
Squares, rectangles, and some triangles, most commonly. Any polygon could have a right angle if it is irregular.
A folded napkin is often folded into a right triangle. The corners of walls can be shaped like a right angle.
All isosceles triangles are not equilateral triangles