A map of the world is 7 feet wide and 3 feet tall. What is its perimeter?
l=7w=3P=2×l+2×w=2×7+2×3=14+6=20 feetl=7 \\ w=3 \\ P = 2 \times l + 2 \times w \\ = 2 \times 7 + 2 \times 3 \\ = 14 + 6 = 20 \;feetl=7w=3P=2×l+2×w=2×7+2×3=14+6=20feet
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