Finding perimeter of shape with semicircles | Geometry (TX TEKS) | Khan Academy

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https://www.khanacademy.org/math/geometry-tx/x790e3ac3e338c450:measurement-of-two-dimensional-figures/x790e3ac3e338c450:arc-length-from-degrees/v/finding-perimeter-of-shape-with-semicircles

Given a figure composed of semicircles, find the exact perimeter in terms of pi. The figure may look unusual, but we can break down the perimeter into very familiar shapes.

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