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Plane Figures 3rd Grade Mrs. Salgado
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right angle An angle that forms a square corner Example:
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angle A figure formed by two rays or line segments that share an endpoint. Example:
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acute angle An angle that has a measure less than a right angle. Example:
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obtuse angle An angle that has a measure greater than a right angle. Example:
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polygon A closed plane figure with straight sides that are
line segments. Examples:
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quadrilateral A polygon with four sides Examples:
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equilateral triangle A triangle that has three equal sides. Example:
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Isosceles triangle A triangle that has two equal sides. Example:
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right triangle A triangle with one right angle Example:
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scalene triangle A triangle in which no sides are equal Example:
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line segment A part of a line that includes two points, called endpoints, and all the points between them. Example:
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radius A line segment with one endpoint at the center of a circle and the other endpoint on the circle. Example:
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