Angle & More
an angle that is less than 90 degress
8 sided polygon
octagon
a triangle with at least two congruent sides
isosceles triangle
a flat figure with both length and width
two-dimensional figure
3 sided polygon
triangle
an angle that is more than 90 degrees but less than 180 degrees
obtuse angle
6 sided polygon
hexagon
triangle with one obtuse angle
obtuse triangle
lines that never intersect
parallel lines
A parallelogram with all sides congruent
rhombus
an angle that is 90 degrees
right angle
a non-polygon
circle
a triangle with 3 congruent sides
equilateral triangle
same size and shape
congruent
a parallelogram with 4 right angles and all sides congruent
square
a parallelogram with 4 right angles
rectangle
5 sided polygon
pentagon
a triangle with 3 acute angles
acute triangle
Lines that form right angles
perpendicular lines
a quadrilateral with exactly one pair of parallel sides
trapezoid
a quadrilateral with 2 sets of parallel sides
parallelogram
a four sided polygon
a quadrilateral
a triangle with a right angle
right triangle
a closed, 2 dimensional figure with straight sides
polygon
a triangle with no congruent sides
scalene triangle