A rhombus doesn't need any right angles to be a rhombus, although
it can have them if it wants to.
If a rhombus has right angles, then it's a square.
And if it has one right angle, then it must have four of them.
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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".