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Liesbeth · Answer 1 · 2023-02-15T13:12:11+0000

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:

$Total\text{ area = 4 }*\text{ l}*\text{ b +}l^2$

Substituting the given side lengths:

$\begin{gathered} Total\text{ area = 4 }*\text{ 20 }*\text{ 12 + 20}*\text{ 20} \\ =\text{ 1360 in}^2 \end{gathered}$

Hence, the total area of Demi's poster is 1360 square in