A triangle may or may not have one right angle, but it can never have more than one. A triangle with one right angle is isosceles only if each of the other two angles is 45 degrees.
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4 right angles, no other angles.
It has 6 angles, none of which are right angles.
A regular hexagon as no right angles. An irregular hexagon could have from none to as many as five right angles.
a tetrahedron has 3 Right angles
There are no right angles in the letter "e".