SOLUTION: Hi tutors!, Help me please. :) QUESTION: The surface area of a candle is {{{125.6in^2}}}.If the candle has a diameter of 4inches,What is the height of a candle? (This is a cylind

Algebra ->  Surface-area -> SOLUTION: Hi tutors!, Help me please. :) QUESTION: The surface area of a candle is {{{125.6in^2}}}.If the candle has a diameter of 4inches,What is the height of a candle? (This is a cylind      Log On


   

Question 436795: Hi tutors!,
Help me please. :)
QUESTION: The surface area of a candle is 125.6in%5E2.If the candle has a diameter of 4inches,What is the height of a candle? (This is a cylinder I found out)
What ive tried:
2xPixR%5E2%2B2xPixRxh= 2xPix2%5E2+%2B+2xPix2xh=125.6
2xPix2%5E2=100.5+%2B+2xPix2=25.1......100.5%2B25.1=125.6in%5E2...But..I think thats wrong! Please help!
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
diameter = 4 inches
radius = 2 inches
surface area = 2pir^2*h + 2pirh
S= 2pir(r+h)
S= 2*3.14*2(2+h)
125.6/12.56= 2+h
10=2+h
h=8 in.