Three rectangles,each of same dimensions are joined as shown in the figure given below. Find the perimeter if the dimensions of each rectangle are 12 cm and 9 cm?

Perimeter is 1-dimensional and is measured in linear units such as inches, feet or meters. Area is 2-dimensional: it has a length and a width. Area is measured in square units such as square inches, square feet or square meters. To find the area of a rectangle, multiply the length by the width.