Math Homework confusion

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How do i work out the radius of a sphere by knowing its surface area

in this case the surface area is 4536.46

Aug 5th, 2015

Thank you for the opportunity to help you with your question!

surface area=4 x pie x r^2

where r= radius, pie=3.14

4 x pie x r^2=4536.46, divide everything by (4x3.14), and get;

r^2=361.183, then get the square root of this number

thu the radius, r=19.005 units

Please let me know if you need any clarification. I'm always happy to answer your questions.
Aug 5th, 2015

thanks how about if it was a cone and i needed to find the slant height and the height using the surface area which is 320.44 m^2 and a base radius of 6m

Aug 5th, 2015

welcome. Ok, that is very simple. Am giving the solution in a minute.

Aug 5th, 2015

surface area of a cone=[pie x r+(sqrth^2+r^2)]

320.44/(3.14x6)=6+sqrt(h^2 + 36)

121=h^2+36

h=9.22m

so using the right angled triangle identity, we get the slant height=11m

Aug 5th, 2015

I welcome you to email me all the maths homework problems that you shall be having. use my email address which is otienoalaka@gmail.com

I will be able to complete them in time and make sure that you score 100%.

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Aug 5th, 2015

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