Diagonal is a line segment joining non-adjacent corners of polygons. Diagonals are defined only for lateral shapes like squares and rectangles. Diagonal length is always greater than polygon sides
Perimeter is the total length of a shape's outline. For any shape, perimeter equals sum of all sides. Real-world distance units must be used in calculations. Online calculators can help verify results
Rectangle is a quadrilateral with four sides. Opposite sides of a rectangle are equal in length. Perimeter is the total distance around the outside edge
Rectangle is a quadrilateral with two equal sides and four right angles. Area of rectangle equals length multiplied by width (A = L * W). All squares are rectangles, but not all rectangles are squares
Rectangle is a quadrilateral with four right angles. Opposite sides are parallel and equal in length. All angles are 90 degrees. All corners lie on a single circle
A rectangle is a closed 2-D shape with 4 sides, corners, and 90° angles. Opposite sides are equal and parallel. It has two dimensions: length and width. Also known as equiangular quadrilateral or right-angled parallelogram