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Question #04486

1 Answer

May 19, 2016

Rounded to nearest foot #->314 " feet"^2#

Explanation:

Let the radius be #r#
Let the diameter be #d#
Let area be #a#

Known:
#a=pir^2#

Same equation in a different form

#r=d/2=> pir^2-> pi(d/2)^2 = pid^2/4#
'~~~~~~~~~~~~~~~~~~~~~~~~~~~

Given that #d=20 ft# we have

#a=pi(20^2)/4#

#a=314.159" feet"^2# to 3 decimal places

Rounded to nearest foot #314 " feet"^2#

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