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We've made it. We survived years of seemingly endless lectures about trigonometry, proofs, and functions. Your 7th grade math teacher rattled off formula after formula for the areas and volumes of different polygons and geometries. All we could do is sit there, listen, and memorize every formula we were given.

We were like power lines transporting the power—our geometry formula—from a power plant that produced the formula to the paper or project, the formulas final home. With calculus, we will never make a memory error about a length, area, or volume formula again. If we aren't sure, we can produce our own formula on the spot.

With our new found power, we will begin our production slowly. Triangles are the simplest and most useful polygons we come across, so we will derive the formula for the area of a triangle first.

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