Finding perimeter of shape with arcs | 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-arcs

Given a figure composed of parts of circles, find the exact perimeter in terms of pi. We can reason about the arc lengths based on the central angles of the arcs.

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