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Home > CCG > Chapter 12 > Lesson 12.2.3 > Problem 12-91

12-91.

Multiple Choice: Assume that , , and . If is rotated counterclockwise () to form , and if  is reflected across the -axis to form , then the coordinates of are:

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Graph .

Rotate the triangle counterclockwise.

Reflect the triangle across the -axis and then find the coordinates of the new triangle.

Triangle A (6, comma 2), B (3, comma 4), C(4, comma negative 1)

Rotate triangle A, B, C, 90 degrees counter clockwise to A prime (negative 2, comma 6), B prime (negative 4, comma 3), C prime (1, comma 4).

Flip A prime, B prime, C prime across the x-axis to A double prime (negative 2, comma negative 6), B double prime (negative 4, comma negative 3), C double prime (1, comma negative 4).

Click the link at right for the full version of the eTool: CCG 12-91 HW eTool (Desmos)
Use this eTool to find the coordinate of C".