As many as you like providing that they measure 90 degrees.
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4 right angles, no other angles.
Capital letters that have right angles depend on the font, but I can find 10:BDEFGHILPRT2 Lower case letters with right angles are:ft
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