Also, every square is a rectangle, but not all rectangles are squares. So treat squares like rectangles in terms of finding its area.
Note that the double hash marks on the long sides of the rectangle mean that the lengths of the two sides are the same.
Note that the single hash marks on the wide sides of the rectangle mean that the two widths have equal length.
A = 4 cm * 5 cm A = 20 cm^2
You can write your final answer in one of two ways: either 20 cm. sq. or 20 cm^2.
Since a rectangle is comprised of four right angles, the diagonal that cuts through the shape will create a right triangle, so you can apply the Pythagorean theorem. The theorem is: a^2 + b^2 = c^2, where a and b are sides of the triangle and c is the hypotenuse, or longest side. [10] X Research source
Ex: 6^2 + b^2 = 10^2 36 + b^2 = 100 b^2 = 100 - 36 b^2 = 64 square root (b) = square root (64) b = 8 The length of the other side of the triangle, which is also the other side of the rectangle, is 8 cm.
Ex: 6 cm * 8 cm = 48 cm^2
