**Unit 1.3 - surface areas of objects made from right rectangular prisms**

**what do we need to know?**

**In previous years, you have learned how to calculate the area of 2-D (two dimensional) figures: Rectangles, squares, circles, and triangles. Before you start studying, read and do the following "Activating Prior Knowledge" sheets. This is going to help you get ready for what's to come:**

math_9_-_unit_1.3_-_what_we_need_to_know.pdf | |

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**class notes**

9_unit_1.3_-_solutions_to_unit_notes.compressed.pdf | |

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**more information**

**How to find the surface area of figures made of linking centimetre cubes**

**Read or download the following document. It contains the two methods we use to calculate the surface area of figures made of cubes.**

ath_9_-_surface_area_of_figures_with_cubes.pdf | |

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**Here is an example of how to use both methods:**

ath_9_-_surface_area_of_figures_with_cubes_-example.pdf | |

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**Here is another example:**

9_unit_1.3_-_surface_area_of_figure_made_of_cubes_-_example_2.pdf | |

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Here are a couple of webpages to help you understand how to calculate the area of an object made of cubes:

**surface area of A rectangular prism**

**Next, let's find out how we can get the surface area of an object made of rectangular prisms. Before we do, let's review how we get the surface area of a "box," or a rectangular prism. THIS IS AN IMPORTANT CONCEPT because the idea behind it, that the area is equal to the sum of the areas of all the faces, IS THE SAME CONCEPT WE WILL BE USING FOR THE REST OF THE UNIT. Take a look:**

**How to find the surface area of figures made of 2 or more rectangular prisms**

**Take a look at the explanation and the examples provided:**

ath_9_-_surface_area_of_figures_made_of_rectnagular_prisms.pdf | |

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**Let's work on the following examples:**

**example 1**

9_unit_1.3_-_surface_area_of_figure_made_of_rectangular_prisms_-_example_1.pdf | |

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**example 2**

9_unit_1.3_-_surface_area_of_figure_made_of_rectangular_prisms_-_example_2.pdf | |

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**example 3**

9_unit_1.3_-_surface_area_of_figure_made_of_rectangular_prisms_-_example_3.pdf | |

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**example 4**

9_unit_1.3_-_surface_area_of_figure_made_of_rectangular_prisms_-_example_4.pdf | |

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**review - workbook**

workbook_-_unit_1.3.pdf | |

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