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1. Find the amount of tin needed to make a milk tin can that has a radius if 2.5 cm and a height of 5 cm.

A. 140.75 cm²

B. 123.75 cm²

C. 117.75 cm²

Use the Formula SA= 2πrh + 2πr²

SA= 2(3.14)(2.5)(5) + 2(3.14)(2.5)²

= (6.28)(2.5)(5) + 2(3.14)(6.25)

=(6.28)(12.5) + (6.28)(6.25)

=78.5 + 39.25

= 117.75 cm²

2. A cosmetics that makes small cylindrical bars of soap wraps the bars in plastic prior to shipping. Find the surface area of a bar soap if the diameter is 5 cm and the height is 2 cm. (Use:π = 3.14)

A. 70.75 cm²

B. 90.75 cm²

C. 70.65 cm²

D. 85.75 cm²

3. A library has an aquarium in the shape of a rectangular prism. It's base is 6 ft. by 2.5 ft. The height is 4 ft. How many square feet of glass was used to build the aquarium with open top?

A. 75 ft²

B. 83 ft²

C. 98 ft²

D. 93 ft²

4. The surface of a sphere is 314 cm². What is the radius?

A. 5 cm

2. 6 cm

C. 4 cm

D. 3 cm

Use this formula SA= 4πr² and the r will be 5 and try to solve if the surface area is 314cm²

SA= 4(3.14)(5)²

= (12.56)(25)

= 314 cm²

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5. Jessa makes a cone shape cake with a radius of 4 inches and a height of 8 inches. How much fondant icing she will need to cover the cake?

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