7. Do you prefer to find the surface area of a cylinder by using the sum of the area of each face or by using a formula? Give at least two reasons for your choice.
A: I prefer to use a formula because it is quicker and I'm less likely to miss a part of the calculation.
9. Kaitlyn and Hakim each bought a tube of candy. Both containers cost the same amount . Which container required more plastic to make?
diameter- 7 cm
height- 122 cm
radius- 3.5 cm
diameter- 11 cm
height- 85 cm
radius- 5.5 cm
Container B required more plastic to make.
10. Paper towel is rolled around a cardboard tube. Calculate the outside surface area of the tube.
height- 27.5 cm
outside SA=345.4 cm²
Cylinder Volume and Volume Problems
r= d/2 r=20/2 r=10 cm V= πrrh V= [(3.14)(10)(10)](40) V= (314cm²)(40cm) V= 12560cm³
r=d/2 r=30/2 r=15 cm V= πrrh V= [(3.14)(15)(15)](20) V= (706.5cm²)(20cm) V= 14130cm³
Martha should buy Popcorn's Lover if she wants more popcorn for her money.
7.85m³-5.024m³=2.862m³ or 2.9m³
The volume of the concrete required to make the culvert is 2.9m³.