Just One, triangles must have 3 angles that add up to a total of 180 degrees, (half a square).
A triangle can have at most one right angle.
A triangle can have at most one right angle.
A triangle can have at most one right angle.
Rectangle has more right angles than the right triangle. The right triangle only has 1 right angle, while the rectangle has 4.
The most right angles a triangle can possibly have is 1. Any more than that, and it has to be a quadrilateral.
A triangle has no right angles when it is not a right angle triangle as for example as in the case of an equilateral triangle that has 3 equal 60 degree angles.
There are no obtuse angles in a right triangle. A right triangle consists of one right angle and two acute angles.
No triangle has any 90-degree angles unless it's a right triangle. Most triangles are not.
Yes. A right triangle is a triangle where one angle is a right angle. If two out of three angles are right angles, then it's an isosceles triangle. If all three angles are right angles, then it is an equilateral triangle.
A triangle can never have three right angles
An obtuse triangle can have no right angles, and has two equal angles.
A right triangle can have 2 equal angles if they are each 45° (any other right triangle will have no equal angles)