Performance Indicator G.G.5 Sample Task
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Name: __________________________________
G.G.5 Know and apply that two planes are perpendicular to each other if and only if one
plane contains a line perpendicular to the second plane
Julie wishes to construct a wall in the basement of her apartment. Describe what she must
do to ensure that the wall is perpendicular to the floor of the basement. Explain why
Julie’s procedure will work, using appropriate mathematical terminology.