Question | Answer |
attribute | properties of a shape; definition of a shape |
polygon | closed plane figure with straight edges that are line segments |
regular polygon | polygon where all the sides are the same length |
2-Dimensional | plane figure that lies on a flat surface |
open figure vs. closed figure | figure in which 2 rays or line segments are not connected with a point vs. figure in which all rays and segments are connected with a point |
triangle | 3 sides; 3 angles (sum 180) |
quadrilateral | 4 sides; 4 angles (sum 360) |
pentagon | 5 sides; 5 angles (sum 540) |
hexagon | 6 sides; 6 angles (sum 720) |
octagon | 8 sides; 8 angles (sum 1,080) |
circle | not a polygon, round edges |
half circle | part of a circle with a straight edge |
right triangle | 3 sides with 1 right angle, 2 acute angles |
acute triangle | 3 sides with 3 acute angles |
obtuse triangle | 3 sides with 1 obtuse angle, 2 acute angles |
scalene triangle | 3 sides with none equal |
isosceles triangle | 3 sides with only 2 equal |
equilateral triangle | 3 equal sides |
square | 4 equal sides, 4 right angles, 2 pairs parallel sides |
rectangle | 2 pairs equal sides, 2 pairs parallel sides, 4 right angles |
rhombus/rhombi | 4 equal sides, 2 pairs parallel sides |
parallelogram | 2 pairs equal sides, 2 pairs parallel sides |
trapezoid | 2 right, 1 acute, and 1 obtuse angle, 1 pair parallel sides…OR… 2 acute and 2 obtuse angles, 1 pair parallel sides |
congruent | plane figures with the same shape and same size |
category | a group of objects that are the same type |
subcategory | a more specific group of objects that are the same type within a category |
classify | to arrange, organize, or order objects that have similar attributes or characteristics (similar to category) |
partition | to divide or separate into parts or sections |
hierarchy | series of ordered groupings within a system |