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After a rotation of 90° about the origin, the coordinates of the vertices of the image of a triangle are A'(6,3), B'(-2, 1)

and C'(1,7). What are the coordinates of the vertices of the pre-image?
С.

User SnitramSD
by
7.0k points

1 Answer

2 votes

Answer:

  • A(3, -6)
  • B(1, 2)
  • C(7, -1)

Explanation:

Rotation by -90° about the origin is the transformation ...

(x, y) ⇒ (y, -x)

So, your pre-image points are ...

A'(6, 3) ⇒ A(3, -6)

B'(-2, 1) ⇒ B(1, 2)

C'(1, 7) ⇒ C(7, -1)

User Yuriy Guts
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7.9k points