A bridge
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Right angles are very important in building construction. A door frame must have right angles to allow the door to open and close smoothly.
Well, there is a fan. It has an obtuse angle. Or a diamond. Hope this helped! ~GMP
9 right angles.
we use angles in everyday life by surveying constuction ,msurgery , military and sports .
A complementary angle is two angles whose sum is 900 (degrees). So you would need a triangular shaped structure whose bottom angles are 450 each. Possibly an Egyptian pyramid?