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Plot triangle with vertices , , and on graph paper. Using the origin as the point of dilation, enlarge it by a factor of (imagine using two rubber bands). Label this new triangle .  

  1. What are the side lengths of the original triangle, ?

    Find by using the Pythagorean Theorem. For this triangle, .

  2. What are the side lengths of the enlarged triangle, ?

    Find  by using the Pythagorean Theorem.

  3. Calculate the area and the perimeter of .

Use the eTool below to to plot triangle ABC and then enlarge from the origin.
Click the link at right for the full version of the eTool: Int2 2-51 HW eTool