Demi is working on a presentation about a famous mathematician for her class. She decides to make her poster in a shape of a + sign

Answer: 1360 in^2
Step-by-step explanation:
Each of the four rectangles on the side is 20x12 inches. Therefore, the total area of the 4 rectangles is 4*20*12 = 960 in^2.
The area of the square in the middle is 20*20 = 400 in^2.
Therefore, the total area = 960 + 400 in^2 = 1360 in^2