25 terms

5.5A Classifying 2D Figures

2D and 3D shapes
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congruent
Having the same measure
two-dimensional
2D, having length and width
attribute
A characteristic
parallel
never intersecting or meeting
degree
A unit for measure for angles and temperatures
polygon
closed figure made by joining line segments
rectangle
A quadrilateral and a parallelogram, angles are congruent and right angles
quadrilateral
2 dimensional object, any 4 sided figure
rhombus
A quadrilateral and a parallelogram, all sides are congruent.
square
A quadrilateral, a parallelogram, a rectangle and a rhombus, all sides are congruent and all angles are congruent.
parallelogram
A quadrilateral, two pairs of opposite sides are parallel.
triangle
3-sided polygon
trapezoid
A quadrilateral with exactly one pair of parallel sides
pentagon
A polygon with 5 sides
hexagon
A polygon with 6 sides
octagon
A polygon with 8 sides
obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees.
acute angle
An angle that is less than 90 degrees
right angle
An angle with a measure of 90 degrees.
acute triangle
A triangle that contains only angles that are less than 90 degrees.
right triangle
a triangle with one right angle
obtuse triangle
A triangle where one angle measures over 90 degrees.
scalene triangle
A triangle, no sides or angles are congruent
isosceles triangle
A triangle, two congruent sides, two congruent angles
equilateral triangle
A triangle, all sides and all angles are congruent

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