A triangle has vertices (-2,-3), (3,5), and (8,-1)

Write a matrix expression to represent rotating the triangle 90° clockwise. Evaluate the matrix expression and list the coordinates of the vertices of the transformed figure.

Please help me! I was absent for the entirety of this lesson due to medical reasons, and I have a test tomorrow!

3 answers

a 90° clockwise rotation takes

(x,y) -> (y,-x)

review your rotation matrix definition.
| +1+0 | -2 +3 +8 |

| +0 -1 | -3 +5 -1 |

| -2 +3 +8 |

| +3 -5 +1 |

(-2,3) (3, -5) (8,1)
That above is for part a) of the assignment if clarification is needed...

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