Angle of elevation and depression
The angle of elevation is the angle you look up from horizontal to see something above you, and the angle of depression is the angle you look down to see something below you; both let you set up a right triangle and use trigonometric ratios to find an unknown height or distance: if a building's shadow is 20 feet long and the sun's angle of elevation is 60 degrees, the building's height is 20 x tan(60 degrees), about 34.6 feet.
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This final covers a lot of topics, so it's split into 2 parts. Each part includes a question from every one of its topics.
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