acute angle - - an angle that measures less than a right angle, less than 90 degrees, acute triangle - - A triangle with 3 acute angles, circle - - a non-polygon with all points located the same distance from the center, congruent - - Having the same size and shape, equilateral triangle - - a triangle with 3 congruent sides, hexagon - - 6 sided polygon, isosceles triangle - - a triangle with at least two congruent sides, obtuse angle - - an angle that measures greater than a right angle but less than a straight angle, obtuse triangle - - a triangle with one obtuse angle, octagon - - 8 sided polygon, parallel lines - - lines in the same plane that never intersect, parallelogram - - a quadrilateral whose opposite sides are both parallel and congruent, pentagon - - 5 sided polygon, perpendicular lines - - Lines that intersect to form right angles, polygon - - a closed, 2-dimensional figure with three or more straight sides, quadrilateral - - a four-sided polygon, rectangle - - a quadrilateral with 4 right angles and opposite sides congruent, rhombus - - a quadrilateral with all sides congruent and opposite angles congruent, right angle - - an angle that measures 90 degrees, right triangle - - a triangle with a right angle, scalene triangle - - a triangle with no congruent sides, square - - a quadrilateral with 4 right angles and all sides congruent, trapezoid - - A quadrilateral with exactly one pair of parallel sides, triangle - - a three-sided polygon, two-dimensional figure - - a figure with two basic units of measure, usually length and width,

Geometry and Measurement

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