The thickness (width or w) should be converted to cm(0.5mm=0.05cm), then find the Volume of the sheet.

The Volume is r2*pi*w or (20 cm)2(0.05cm) * pi which equals62.8319 cm3 or 63cm3 when considering the significant digits.

You need to look up the density of aluminum somewhere. If youdid you would probably find it to be somewhere around 2.70 gramsper cm3

Density(p)=mass(m)/volume(v)

If you multiply v by both sides of the equation you will havem=p*v

mass=(2.70g/cm3)(63cm3)=170.1g or considering the significantdigits 170 grams.

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∙ 8y agoThis answer is: