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21 Cards in this Set
- Front
- Back
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Acute
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an angle that measures less than 90°
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Angle
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two rays with a common endpoint (the vertex)
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Angle congruency marks
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angle marks indicating angles of the same measure
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Area
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the measurement attribute that describes the number of square units a figure or region covers
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Attributes of two-dimensional figures
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characteristics that define a geometric figure (e.g., sides, vertices, etc.)
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Classify
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applying an attribute to categorize a sorted group
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Congruent
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of equal measure, having exactly the same size and same shape
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Conversion
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change from one unit to another unit
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Irregular Figure
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a polygon with sides and/or angles that are not all congruent
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Obtuse
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an angle that measures greater than 90° but less than 180°
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Perimeter
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a linear measurement of the distance around the outer edge of a figure
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Polygon
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a closed figure with at least 3 sides, where all sides are straight (no curves)
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Properties of two-dimensional figures
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relationship of attributes within a geometric figure (e.g., a square has 4 congruent sides and 4 right angles, etc.) and between a group of geometric figures (e.g., a square and a rectangle both have 4 sides and 4 right angles; however, a square has 4 congruent sides but a rectangle has only opposite sides congruent; etc.)
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Regular figure
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a polygon with all sides and angles congruent
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Right
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an angle (formed by perpendicular lines) that measures exactly 90°
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Side
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a line segment that forms the boundary of a two-dimensional figure
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Side congruency marks
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side marks indicating side lengths of the same measure
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Three-dimensional figure
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a figure that has measurements including length, width (depth), and height
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Two-dimensional figure
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a figure with two basic units of measure, usually length and width
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Vertex (vertices) in a two-dimensional figure
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the point (corner) where two sides of a two-dimensional figure meet
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Volume
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the measurement attribute of the amount of space occupied by matter
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