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11 September, 23:14

Find the diameter of a circle with an area of 804.2 square centimeters. (Use 3.14 for)

Select one:

a. 32 cm

b. 8 cm

c. 48 cm

d. 64 cm

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Answers (1)
  1. 12 September, 01:26
    0
    A=pir^2

    pi=3.14

    2r=d

    804.2=pir^2

    804.2=3.14r^2

    divide by 3.14

    256.1146 ... = r^2

    sqrt both sides

    16=r

    2r=d

    2*16=d=32

    answer is A
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