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1. What is the surface area of a cube whose side is 5 cm? *
A. 30 sq. Cm
B. 60 sq. Cm
C. 90 sq. Cm
D. 150 sq. Cm
2. A cylinder is 3 inches-tall and the radius of its circular base is 2 inches. What is its surface area? *
A. 20. 56 sq.
B. 25. 12 sq.
C. 37. 68 sq.
D. 62. 8 sq. In
3. A rectangular shipping container has a length of 7 inches, width of 12inches and height of 6 inches. Find the surface area of the shipping container? *
A. 240 inches²
B. 256 inches²
C. 250 inches²
D. 396 inches².

Sagot :

CloudyClothyidn

SURFACE AREA

Answers:

1. What is the surface area of a cube whose side is 5 cm?

  • D. 150 sq. Cm
  • The question talks about the surface area of cube, the formula is 6a², where a is the centimeter of a given cube.

[tex] \sf{6(5)^{2} } = (6)(25) = \boxed{ \sf \bold{150 \:sq. \: cm }}[/tex]

2. A cylinder is 3 inches-tall and the radius of its circular base is 2 inches. What is its surface area?

  • C. 37.68 sq.
  • The question talks about the surface area of cylinder, the formula is 2π(r)(h), where r is the radius and h is the circular base of a cylinder.

[tex] \sf{2π r h} = 2π (3)(2) = \boxed{ \sf \bold{37.68}}[/tex]

3. A rectangular shipping container has a length of 7 inches, width of 12 inches and height of 6 inches. Find the surface area of the shipping container?

  • D. 396 inches².
  • The question talks about the surface area of rectangle, the formula is 2(lw+lh+wh) where l is the length, w is the width and h is the height of a rectangular shipping container.

[tex] \sf{2((l)(w)+(l)(h)+(w)(h))} \\ \: \: \: \: \: \sf{2((7)(12)+(7)(6)+(12)(6))} \\ \sf{2(84 + 42 + 72)} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \sf{2(198)} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \boxed{ \sf \bold{ = 396 \: inches^{2} }} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]

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