Angles are useful because they allow the natural world to be described accurately. A right angle - 90 degrees - is an example of a particular angle common in modern life, e.g. at the four corners of a table.
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It has 6 angles, none of which are right angles.
Yes, the 4 inside angles are right angles
4 right angles, no other angles.
No, the angles aren't right angles.
"How are straight angles different from right angles?" Is this a statement?