Rotations in the coordinate grid

We look at rotating a point 90 degrees around the origin, and how the coordinates of the point "flip" or switch, plus there is possibly a change in the sign of one of the coordinates. For example, point (5, 2) when rotated clockwise around the origin, becomes (2, −5).

Then I show how to rotate a point around another point (the center point of rotation), again 90 degrees either clockwise or counterclockwise.

Lastly, we rotate an entire triangle 90 degrees around a certain point in the coordinate grid.

See also

Translations and reflections — video lesson

Practice geometric transformations online

Math Mammoth Grade 8 curriculum

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