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unit 1 by Mind Map: unit 1

1. Obtuse angle- a triangle with one angle larger than 90 degrees but less than 180 degrees.

2. Point-to identified with a number or letter to specify an exact location.

3. Midpoint-a point that is in the middle.

4. Endpoint-a point thats at the end of a ray or one of the end of a line segment.

5. Vertex- a vertex is each point of a polygon or other figures.

6. Angle-an angle is two rays and an endpoint.

7. Acute angle-a triangle that angles are between 0 and 90 degrees.

8. Right angle-a triangle with one 90 degree angle.

9. Ray- a ray is a set of straight lines passing through one point.

10. Straight angle-a angle of 180 degrees.