numeral

a symbol used to represent a number

expanded form

A way to write numbers by showing the value of each digit

place value

The value of a digit based on its position within a number.

perimeter

The distance around a figure

area

the number of square units needed to cover a flat surface

square

(geometry) a plane rectangle with four equal sides and four right angles

rhombus

a parallelogram with 4 congruent sides

rectangle

a parallelogram with four right angles

parallelogram

A quadrilateral with two pairs of parallel sides

quadrangle

A four-sided polygon

polygon

a closed plane figure bounded by straight sides

parallel

lying in the same direction and always the same distance apart

trapezoid

a quadrilateral with two parallel sides