Rotational symetry

​Rotational Symmetry

By Ms Liang

RIDDLE

What’s a polygon that’s been in a fight?

RIDDLE

What’s a polygon that’s been in a fight?


Polygon

Multiple Choice

A figure has ____________ if the figure can be rotated its center less than one full turn, so that the image coincides with the pre-image.

• Transformation

• Rotational Symmetry

• Line Symmetry

• Rigid Motion

Multiple Select

Is this rotational symmetry?

• No

• Yes

Multiple Select

What angles of rotational symmetry does this figure have? Check ALL that apply!

• 90°

• 180°

• 270°

• 45°

​Pre image 90 degree Rotated image

Poll

Is this rotational symmetry?

• Yes

• No

Poll

Is this rotational symmetry?

• Yes

• No

Poll

Is this rotational symmetry?

• Yes

• No

​Not rotational symmetry, because the least angle being rotated to maps onto itself is 360 degree

Multiple Choice

Which formular we can use to find the angle of rotation for regular polygon?

• n * 90°
• 360° / n
• 360° * n
• 180° / n

Multiple Choice

Which of the following transformations carry this regular polygon onto itself?

• Rotation of 36 degrees counterclockwise

• Rotation of 120 degrees counterclockwise

• Rotation of 90 degrees counterclockwise

• Reflection across $$\ l$$

Multiple Choice

Which of the following transformations carry this regular polygon onto itself?

• Rotation of 45 degrees counterclockwise

• Rotation of 72 degrees counterclockwise

• Rotation of 60 degrees counterclockwise

• Reflection across $$\ l$$

Multiple Select

Which of the following transformations carry this regular polygon onto itself?

• Rotation of 45 degrees counterclockwise

• Rotation of 60 degrees clockwise

• Rotation of 60 degrees counterclockwise

• Rotation of 36 degrees counterclockwise