acute angle - an angle whose measure is less than 90 degrees, angle - the space between two intersecting lines close to the point where they meet, equilateral triangle - triangle with three equal sides, isosceles triangle - triangle with 2 equal sides, line of symmetry - divides figure into two mirror-image halves, obtuse angle - an angle whose measure is greater than 90 degrees but less than 180, parallel lines - two lines that are always the same distance apart and never touch, parallelogram - a four-sided figure with opposite sides parallel, perpendicular lines - two lines that intersect and form a right angle, polygon - 2-dimensional shapes made of straight lines, and the shape is closed, quadrilateral - a polygon with 4 sides, rectangle - a polygon with four sides and four right angles, and opposite sides are equal, rhombus - parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides, right angle - an angle with a measure of 90 degrees, scalene triangle - Triangle with no equal sides, square - a polygon with four equal straight sides and four right angles., trapezoid - a quadrilateral with at least one pair of parallel sides, area - the size of a surface measured in square units, perimeter - the boundary of a closed geometric figure, irregular polygon - polygons that have unequal angles and unequal sides,

Geometry Vocabulary

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