If two angles are right angles, their sum is 90o + 90o = 180o leaving nothing for the third angle.
There is no triangle with two right angles.
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a 'SCALENE' triangle. ; No equal sides, and no equal angles. An ISOSCELES triangle has two equal sides and two equal angles. An EQUILATERAL tringle has three equal sides and three equal angles all at 60 degrees. A RIGHT ANGLED triangle has one right angle (90 degrees) in it.
a triangle..
A triangle cannot have four angles.
An isosceles triangle.
A triangle in which one angle is equal to 90o is called a right triangle. A triangle in which all sides are equal (or) all the angles are equal to 60o is called an equilateral triangle. A triangle in which any two sides or any two angles are equal is called an isosceles triangle. A triangle in which all the sides or angles are different is called a scalene triangle.