Rotations about a Vertex

This video tutorial explains how to rotate figures about a point in a coordinate plane. It covers rotating triangle ABC 90 degrees clockwise about vertex B and provides an exercise to rotate the triangle 180 degrees about vertex A. The tutorial emphasizes understanding the fixed point of rotation and visualizing the movement of vertices. It concludes with a summary of the key concepts of rotating figures around a point.

What is the center of rotation when rotating triangle ABC 90 degrees clockwise?

• Vertex A

• Vertex B

• Vertex C

• The origin

When rotating a figure 90 degrees clockwise, what happens to the center of rotation?

• It disappears

• It rotates with the figure

• It remains fixed

• It moves to a new position

How many turns are needed to rotate a figure 180 degrees?

• Two turns

• One turn

• Three turns

• Four turns

What tool can help visualize the rotation of a figure about a point?

• A calculator

• A protractor

• Tracing paper

• A ruler

After rotating triangle ABC 180 degrees about vertex A, which vertex remains unchanged?

• Vertex C

• Vertex B

• Vertex A

• The origin