SOLUTION: I need to give my teacher an example of a problem that needs proving the area. i don't have one that i can find online.
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-> SOLUTION: I need to give my teacher an example of a problem that needs proving the area. i don't have one that i can find online.
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You can put this solution on YOUR website! Proving the area of what? Proving the area of a square, rectangle, triangle, parallelogram are quite easy. If you wish to prove the area of a circle or ellipse you might very likely need to use some calculus for these. The area of a general triangle or quadrilateral is significantly more difficult than these (look up "Heron's formula" or "Bretschneider's Formula").
