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geometry

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find the area of the sector with 80 degree angle and radius=8

  • geometry -

    Area = 1/2 r² θ

    Sound familiar? The whole circle has 2π radians, so the area = 1/2 * 2π r^2 = πr^2

    Anyway, you have 80°, which is 80*/360 * 2π = 2π/9

    So, the area is 1/2 * 2π/9 * 8² = 22.34

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