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Answer:
128 square feet
Step-by-step explanation:
Horizontal Gray parts:
12 - 8 = 4 ÷ 2 = 2
2 * 24 = 48 * 2 = 96
Vertical gray parts:
24 - 20 = 4 ÷ 2 = 2
2 * 8 = 16 * 2 = 32
All together:
96 + 32 = 128 square feet