rectangle - a quadrilateral with four right angles
Rectangle Word ProblemFree Rectangle Word Problem Calculator - Solves word problems based on area or perimeter and variable side lengths
Rectangles and ParallelogramsFree Rectangles and Parallelograms Calculator - Solve for Area, Perimeter, length, and width of a rectangle or parallelogram and also calculates the diagonal length as well as the circumradius and inradius.
Ten FrameFree Ten Frame Calculator - Builds a ten frame (dot card) for a number and shows numbers more and less.
