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If the base of the elevation is at a distance d from the observer, then the highest point is at a height = d*tan(angle of elevation)
If the angle from the base to the highest point is a right angle, it is right. If not, it is oblique.
A critical angle refers to the highest angle the light can possibly refract into or between objects without disappearing. ie = light going from crystal into water, the critical angle is 47degrees.
It is the angle opposite the given side of a figure (<CAB has Vertex of A because it is the tip of the moutain, which is the highest point)
That depends a lot of the angle at which sunlight hits a region, and an angle makes a different in how much the sun warms an area. lol