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# this paint can holds 2.5 litres with a height of 20cm work out the radius of the can

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this paint can holds 2.5 litres with a height of 20cm work out the radius of the can

Guest Mar 31, 2017
#1
+7324
+2

2.5 litres = 1,000 * 2.5 = 2,500 cubic cm

volume = π * radius2 * height

2,500 = π * r2 * 20

$$\frac{2,500}{20\pi}=r^2 \\~\\ \sqrt{\frac{2,500}{20\pi}}=r \\~\\ 6.307 \approx r$$

hectictar  Mar 31, 2017
#2
+7324
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That should be 6.307 centimeters, sorry I meant to put that!

hectictar  Mar 31, 2017