Change places by pivoting the figure. The section of a geometry playlist introduces rotations by making the connection to rotational symmetry. The presentation provides formulas to use with the coordinates when rotating a figure around the origin a multiple of 90 degrees.

Concepts

transformations, rotations, angle of rotation, coordinate geometry, coordinate plane

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Additional Tags

math

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Instructional Ideas

• Use manipulatives and have learners discover the rules for multiples of 90-degree rotations

Classroom Considerations

• Assumes individuals know the total degrees needed to rotate all the way around
• It is helpful if pupils have learned about rotational symmetry

• This video is hosted on YouTube

Pros

• Uses colors to distinguish the image from the pre-image
• Links to more resources on rotations

Cons

• When originally referring to 180-degree rotation, the presenter places the figure into the wrong quadrant

Common Core

8.G.A.3 HSG-CO.A.5 MP2 MP6