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approximate

more or less correct or exact

estimate

an approximate answer

arithmetic

the branch of mathematics that deals with adding, subracting, multiplying, and dividing

mutliple

a product of the number multiplied by a whole number

geometry

the branch of mathematics that deals with the measuring of line, angles, surfaces, and solids

octagon

a figure with eight sides

circumference

the distance around a circle

perimeter

the distance around a polygon

parallel

referring to line that never intersect

perpendicular

coming together to form a right angle