The plus sign is a composite of rectangles . The shape is comprised of:
1. 4 congruent rectangles with sides 20 in and 12 in
2. A square at the center with sides 20 in by 20in
The total area of Demi's Tester ca be found using the formula:
[tex]Total\text{ area = 4 }\times\text{ l}\times\text{ b +}l^2[/tex]
Substituting the given side lengths:
[tex]\begin{gathered} Total\text{ area = 4 }\times\text{ 20 }\times\text{ 12 + 20}\times\text{ 20} \\ =\text{ 1360 in}^2 \end{gathered}[/tex]
Hence, the total area of Demi's poster is 1360 square in
