Right angles are used in architecture. All buildings are essentially based off of right angles (from the ground to a wall).
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You can use straight angles to make sure countertops, or walls are straight and in a right formation.
You can use them to find the sides and angles of a right triangle... just like regular trigonometric functions
Since the rectangle has right angles, you can use Pythagoras' Theorem in this case.
The Arabic numbers, which is what are numbers are based on for the English language and are very similar to, use to have no curves or curved angles in them and had all acute, obtuse, or right angles. According to what number it was (for example 3) had three angles. Another example is 4, which still has four angles today.
angles in our daily life