Math
Rectangles and squares.
Definition
A rectangle is a parallelogram with four right angles. A square is a rectangle with four equal sides. Both have diagonals that are congruent, and in a square, diagonals are also perpendicular.
Examples
Real-world.
- 1 A rectangle with length 8 and width 5 has area 40 and perimeter 26
- 2 A square with side 6 has area 36 and diagonal 6√2
- 3 A computer screen is a rectangle; a checkerboard tile is a square