High School Math : Graphing

Study concepts, example questions & explanations for High School Math

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Example Questions

Example Question #1 : Graphing

The vertices of a triangle are given by \(\displaystyle (0,3), \; (0,5),\; and \; (-2,4)\).  The triangle is rotated about the origin by \(\displaystyle 90\) degrees clockwise.  What are the new coordinates?

Possible Answers:

\(\displaystyle (6,0), \; (10,0),\; and \; (8,4)\)

\(\displaystyle (-9,0), \; (-15,0),\; and \; (-12,-6)\)

\(\displaystyle (4,1), \; (6,1),\; and \; (5,3)\)

\(\displaystyle (3,0), \; (5,0),\; and \; (4,2)\)

\(\displaystyle (-3,0), \; (-5,0),\; and \; (-4,-2)\)

Correct answer:

\(\displaystyle (3,0), \; (5,0),\; and \; (4,2)\)

Explanation:

The coordinates form a triangle in the second quadrant with a side along the y-axis.  The rotation about the origin by \(\displaystyle 90\) degrees clockwise results in a triangle in the first quadrant with a side along the x-axis.  There are two responses that give triangles along the x-axis: 

\(\displaystyle (3,0), \; (5,0),\; and \; (4,2)\) and

\(\displaystyle (6,0), \; (10,0),\; and \; (8,4)\)

A rotation and a dialation by a factor of \(\displaystyle 2\) is given by

\(\displaystyle (6,0), \; (10,0),\; and \; (8,4)\), so the correct answer is \(\displaystyle (3,0), \; (5,0),\; and \; (4,2)\)

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