rectangle - a quadrilateral with four right angles
Free Describe Two-Dimensional Shapes Calculator - Calculates the following:
Given a description of a 2D shape, it will return the shape (Circle, rectangle, square, triangle, etc.)
Free Rectangle Word Problem Calculator - Solves word problems based on area or perimeter and variable side lengths
Free 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.
Free Ten Frame Calculator - Builds a ten frame (dot card) for a number and shows numbers more and less.