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January 26, 2015

January 26, 2015

Posted by **black mamba** on Wednesday, March 23, 2011 at 11:47am.

- math -
**Writeacher**, Wednesday, March 23, 2011 at 11:59amhttp://www.aaamath.com/ >>> http://www.aaastudy.com/geo.htm >>> Surface area

- math -
**jai**, Wednesday, March 23, 2011 at 1:16pmrecall that the area of a circle is given by:

Area = pi*r^2

since in the problem, diameter is given, we first get radius:

diameter = 2*radius

d/2 = r

15/2 = 7.5 ft = r

thus

A = pi*r^2

A = 3.14*7.5^2

A = ?

now solve this using calculator,,

to round off, first you need to know the place of the digit you want to round off,, in the problem it's 'to the nearest whole number (or the ones digit)'. thus we look at the number to the right of ones digit

if the number to the right of ones digit is:

*greater than or equal to 5, you add 1 to ones digit

*less than 5, the ones digit does not change

for example,,

342.67 --->rounding off to nearest whole number gives 343

now apply this to the answer you've got. :)

hope this helps~ :)

- math -
**Anonymous**, Wednesday, March 23, 2011 at 4:56pmA=d^2*pi/4

A=(15^2)*3.14159/*4

A=225*3.14159/4

A=706.85775/4

A=176.7144375 ft^2

A=177 ft^2

rounded to the nearest whole number

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