| an angle that measures less than 90 degrees |
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| distance from center of circle to any point on the circle's circumference |
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| line segments that cross to form four right angles |
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| part of a line between two points |
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| an angle that measures 90 degrees |
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| a triangle with all three sides of equal length |
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| line segments that never intersect |
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| an angle that measures more than 90 degrees |
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| the distance around the circle |
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