Deductive versus Inductive Reasoning



Volume and Surface Area

|Objectives: | |

|Calculate the volume of given geometric figures. | |

|Calculate the surface area of given geometric figures. | |

|Solve word problems involving volume and surface area. | |

|Vocabulary: | |Formulas: |

|volume | |Volume of a rectangular container: |

|surface area | | |

|sphere | | |

|pyramid | |Volume of a cylindrical container: |

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| | |Surface area of a rectangular container: |

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| | |Surface area of a cylindrical container: |

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| | |Volume of a sphere: |

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| | |Surface area of a sphere: |

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| | |Volume of a cone or pyramid: |

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Possible Classroom Examples:

Find the volume and surface area of the figures below:

[pic] [pic]

[pic]

Find the volume of the figures below:

[pic] [pic]

From an 8.5-inch by 11-inch piece of cardboard, 1.5-inch square corners are cut out and the resulting flaps are folded up to form an open box.  Find the volume and surface area of the box.

A propane gas tank consists of a cylinder with a hemisphere at each end.  Find the volume of the tank if the overall length is 10 feet and the diameter of the cylinder is 4 feet.

[pic]

A regulation baseball (hardball) has a circumference of 9 inches; a regulation softball has a circumference of 12 inches.

a. Find and compare the volumes of the two types of balls.

b. Find and compare the surface areas of the two types of balls.

Ron Thiele bought an older house and wants to put in a new concrete driveway. The driveway will be 36 feet long, 9 feet wide, and 6 inches thick. Concrete (a mixture of sand, gravel, and cement) is measured by the cubic yard. One sack of dry cement mix costs $7.30, and it takes four sacks to mix up 1 cubic yard of concrete. How much will it cost Ron to buy the cement?

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