math,algerbra

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find circumference and area of circle use 3.14 for unknown round to nearest tenths. 2) r=11.5
3)d=3.5
show steps to solve

  • math,algerbra -

    area of circle is given by equation:

    A = pi*r^2 ,
    where A is area
    pi is 3.14
    r is radius

    2) A = pi*(11.5^2) = 3.14*(11.5^2) = ?
    3) radius is half the diameter d
    so r = 3.5 /2 = 1.75
    Then area is,
    A = pi*(1.75^2) = 3.14*(1.75^2) = ?

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