parallelogram

a quadrilateral with 2 sets of sides that are parallel

quadrilateral

a polygon with four sides

polygon

a closed figure with straight lines

perpendicular

two lines that meet in a right angle

perimeter

the measurement around the edge of a figure

pentagon

a polygon with 5 sides

parallel lines

two straight lines that do not intersect

octagon

a polygon with 8 sides

rectangle

a parallelogram with 90 degree angles

rhombus

a parallelogram with congruent sides

right angle

a 90 degree angle

congruent

coinciding at all points when superimposed

equilateral triangle

a triangle with three sides congruent

hexagon

a polygon with 6 sides