Question 1073968: A painter has a 4L can of paint. she needs to paint the outside of a cylinder standing on the ground...... The cylinder stands 1m tall and has a diameter of 20cm. Does she have enough paint? Explain!
Found 2 solutions by addingup, MathTherapy:
Answer by addingup(3677)   (Show Source):
You can put this solution on YOUR website! You can't have meters and centimeters, it's like mixing apples and oranges. The cylinder has a diameter of 20 cm and is 100cm tall (1m = 100cm)
So your cylinder has an outside surface area of 20*Pi*100
There is not enough information to tell you if she has enough paint because you are not saying how thick she wants the paint coat to be.
Answer by MathTherapy(10552)  (Show Source):
You can put this solution on YOUR website!
A painter has a 4L can of paint. she needs to paint the outside of a cylinder standing on the ground...... The cylinder stands 1m tall and has a diameter of 20cm. Does she have enough paint? Explain!
Is it too much to say, "Please explain?"
Get the lengths in the same measurement by converting the height (1 m) to cm, or the radius (in cm) to meters
Surface Area of cylinder: 2πr2 + 2πrh, but since it's assumed that only the top, and not the bottom will be painted, then it's: πr2 + 2πrh
You're given the diameter, so you need to calculate r (radius).
To get your answer, you'll need to know how much paint covers each sq cm or sq m, depending on what measurement you converted to.
This should be enough for you to solve this!
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