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28 August, 14:32

Area of a circular ring: A = 4pw

Solve for p. Find p when A = 22 cm^2 and w = 2 cm

Perimeter of a track: P = 2r + 2x

Solve for r. Finf r when P = 440 yrds and x = 110 yrds

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  1. 28 August, 14:57
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    1a) A = 4πpw

    /4πw = / 4πw

    A / 4πw = p

    1b) A = 4πpw

    22 = 4πp (2)

    p = 11/4π (≈0.87)

    2a) P = 2πr + 2x

    P - 2x = 2πr

    /2π / 2π

    P-2x / 2π = r

    2b) P = 2πr + 2x

    440 = 2πr + 2 (110)

    r = 110/π (≈35.014)
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