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rectangle

a parrallelogramnthat has four right angles,but does not have four equal sides.

obtuse angle

an angle greater than 90 degress but less than 180 degress.

decagon

a ten sided polygon.

tiling

when you can fit polygons 360 degress around a point.

hexagon

a six sided polygon.

regular polygon

any polygon with all equal sides.

right angle

an angle equal to 90 degress.

square

a parallelogram with four right angles and four equal angles.

octagon

an eight sided polygon.

heptagon

a seven sided polygon.

angle

is formed by two sides meeting a vertex in a polygon.

degress

a unit of measurement for angles.

equilateral triangle

is a triangle with all equal sides.

isosceles triangle

a triangle with two equal sides.

parallel lines

lines that never meet

parallelogram

a 4 sided polygon where the opposite sides are an equal distance apart.

pentagon

a 5 sided polygon.

quadrilateral

any 4 sided polygon.

scalene triangle

a triangle with no equal sides.

polygon

a closed figure/straight sides/no intersections.

rhombus

[all sides equal]one pair obtuse angle and one pair acute angle.

dodecadon

a 12 sided ploygon.

ninogon

a 9 sided polygon.

quadrilatrals

a 4 sided polygon.

triangle

a 3 sided polygon.