its just called a right triangle. one angle is 90 degrees and two other angles are 1-89 degrees.
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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..."
A triangle is a 3 sided polygon
A triangle is a polygon, though trigon is an alternative name for a 3 sided polygon.
A triangle is a polygon with 3 sides