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 Interactive Checkpoint
 Altitude of a Triangle:  The perpendicular distance between a vertex of a triangle and the side opposite that vertex. Sometimes called the height of a triangle. Also, sometimes the line segment itself is referred to as the altitude.

 In the interactive diagram at the right, identify: Sorry, this page requires a Java-compatible web browser.

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Graded Response
  a) an altitude if the base is BC  a)  
 b) a base if the altitude is BD  b)