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5th Grade Geometry Vocabulary: 2D FiguresMastery: 0%

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equilateral
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all sides are equal
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congruent
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equal or same size, shape, etc.
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right angle
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an angle that is exactly 90 degrees
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equiangular
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all angles are equal
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isosceles
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at least two equal sides
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obtuse angle
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an angle that is more than 90 degrees but less than 180 degrees
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scalene
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all sides are different
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perpendicular
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forming a right angle with each other
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adjacent
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next to each other
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interior angles
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the angles formed inside the corners of a polygon
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vertex
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corner
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side
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edge
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opposite sides
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two sides that are directly across from each other
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adjacent sides
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sides that are right next to each other
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acute triangle
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a triangle whose three angles are each less than 90 degrees
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right triangle
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a triangle that has one 90 degree angle
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isosceles triangle
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a triangle that has at least 2 equal sides and at least 2 equal angles
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obtuse triangle
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a triangle that has one angle that is larger than 90 degrees
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quadrilateral
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a polygon that has 4 straight sides and 4 angles
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square
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a quadrilateral that has 4 right angles and 4 equal sides
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rectangle
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a quadrilateral that has 4 right angles and at least 1 pair of equal sides
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rhombus
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a quadrilateral that has 4 equal sides and 2 pairs of equal angles
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parallelogram
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a quadrilateral that has 2 pairs of parallel sides
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kite
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a quadrilateral that has 2 pairs of adjacent equal sides
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trapezoid
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a quadrilateral that has at least one pair of parallel sides
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acute angle
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an angle that is more than 0 degree and less than 90 degrees
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parallel
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never intersecting
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polygon
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any flat, closed shape that has 3 or more straight sides and angles
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regular polygon
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a polygon that has all sides and all angles equal
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