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Welcome to the Angles Shelf!
An angle is a figure made by extending the straight sides of a sector away from the corner where they meet. The lines are supposed to go on forever, but we can't actually draw lines that long, so we just stop where we like and imagine the lines going on forever.
The sides of the sector are part of the angle, but the rest of the sector is not part of the angle. Still, we often draw a small sector as part of the picture of an angle.
Here are pictures of some angles:
On this shelf, you can find work for comparing angles with sectors and turns. You will also learn to sort angles, to name particular angles, to measure angles, and to use angle relationships to figure out angle measurements.