When the length and width of a rectangle are equal the shape is a special case of a rectangle called a square. If you subtract the area of the small rectangle from the area of the large one the resulting area shaded in yellow equates to 21. Now that youve used the Pythagorean Theorem to find the second side length you can solve for the area.
Dont forget your units.
You will see the units written as ft 2 m 2 cm 2 etc. When the length and width of a rectangle are equal the shape is a special case of a rectangle called a square. Make sure you substitute for the correct variables. Use guess and check and revise to find the dimensions of 1 rectangular mat.