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| An angle that is between 0 and 90 degrees |
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| Two coplanar angles with a common side and a common vertex. |
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An angle is formed by two rays with the same endpoint (called the vertex of the angle).
You can name an angle by its vertex if that vertex doesn't belong to any other angles, or you can name it by three points, with the middle point being the vertex and each of the other two points being a point on each of the two rays. |
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| A ray that divides an angle into two congruent angles. |
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| Points that lie on the same line. |
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| A geometric tool used to draw circles and parts of circles called arcs. |
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| Two angles, the sum of whose measure is 90 degrees. |
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