select one of the right rectangular prisms provided. |

trace around each of the sides of the prism you selected. |

measure the length and width of each rectangle. |

how many rectangles in all? |

how many of the rectangles are the same size and shape? |

using your calculator, calculate the area of each rectangle you traced. |

add each of the areas together to determine the total surface area of the rectangular prism
you selected. |

repeat the above process with a new rectangular solid, but estimate the total surface area
before you begin tracing. Compete against a friend to see who can make the best estimate! |

**Challenge:** out of paper, build a rectangular solid with a surface area of 120 cm2. |