Question

it is indicated by a rectangle with a vertical line .option a playhead. option b frame. option c ki frame​

Answer 1

Answer:

A vertical line is one the goes straight up and down, parallel to the y-axis of the coordinate plane. All points on the line will have the same x-coordinate. In the figure above, drag either point and note that the line is vertical when they both have the same x-coordinate.

A vertical line has no slope. Or put another way, for a vertical line the slope is undefined. As you drag the points above, notice that the slope indicator goes away when the line is exactly vertical.

Answer 2

Answer:

The playhead, represented by a red rectangle with a long red line, shows the current frame you are viewing on the timeline. You can click a frame to move the playhead to that frame, or you can drag the playhead back and forth on the timeline to quickly view all or any part of your animation.