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?
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The Equator is a real world example, being the circumference of the Earth.
Vertex describes a point , corner or intersection. For example a black diamond library. It is construction-ed with many points and each angle should be considered a vertex.
An Obtuse angle is more than 90° but less than 180°. Real life examples would be fans, and most rooftops of houses and buildings.
A right angle triangle always has 2 acute angles within it.