To show a right angle you have to mark the inside corner so that it looks like a square.
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If you wan't to show that a pentagon has no right angles, then don't put any right angle signs in the figure.
That's exactly what the box means! That box is there to show that an angle is right, as right angles can have different properties than acute or obtuse angles.
Because a right angle is a right angle.
Assuming your question is what makes a right-angle, it is an angle of 90o .
because a right angle is right and a left angle is wrong