Rotating Shapes

We are able to rotate shapes on a coordinate grid using a rule.   We first need to know what our centre of rotation is.

centre of rotation is a fixed point around which other point in a shape will rotate.  They will rotate in a clockwise (CW) or counterclockwise (CCW) direction.

Take a look at this picture.  In this coordinate grid, we can see a rotation has occurred. The triangle ABC have moved a 1/4 turn CW.

In this picture we see the Triangle ABC has moved 1/4 turn CW.  The image A`B`C` of that triangle is now in its new location.  If you were to face the point of rotation looking up from the new C`, you would find yourself 1 L and 4 down from the star.

In this picture we see the Triangle ABC has moved 1/4 turn CW. The image A`B`C` of that triangle is now in its new location. If you were to face the point of rotation looking up from the new C`, you would find yourself 1 L and 4 down from the star.

If we look at  a picture of a circle that has been divided into parts (quarters), we can see this rotation as well.  Take a look below.

We can see that this movement is clockwise if we look at the blue arrows surrounding the circle.

We can see that this movement is clockwise if we look at the blue arrows surrounding the circle.

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