Saturday

August 23, 2014

August 23, 2014

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

**Related Questions**

geometry - A CIRCLE HAS AN AREA OF 50 SGUARE FEET.WHAT IS THE APPROXIMATE ...

10th grade - If a circle has a diameter of 7inches, what is the circumference ...

Circumference and Area of Circles - can someone help me with these:Find the ...

math - i am a decimal with my last digit in the hundredths. rounded to the ...

Rounding Decimals - Use the digits 0,2,5 and 8. Write a decimal that will round ...

Math - The diameter of a circle is 7 inches. What is the circumference of the ...

math - I'm asked to find the circumference of a circle to the nearest tenth and ...

Math - How many cubic yards of concrete will it take to fill a cylindrical ...

Math - Math Problem: Find the area of a circle that has a radius of 14 feet. ...

Math - Find the whole number that meets all the following conditions 1. It is ...