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There is such a thing as a regular heptagon, but it cannot be constructed under the rules of classical Greek construction. Any heptagon constructed under these rules will therefore be irregular. This is because the interior angle of a heptagon is (5pi)/7 radians, which cannot be constructed without a neusis construction or an angle trisector.
Right angle, obtuse angle, acute angle, supplementary angle, complementary angle, interior angle, exterior angle, adjacent angle
The angle of incidence
the angle of incidence is the initial ray angle and the angle of reflection is the reflected ray angle
It is a reflex angle