If you're in the UK, area code 020 is London. The '3' is the first digit of the local number, not the last digit of the area code.
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length x width = area
You can convert the built up area into the carpet area by simply covering the area in a carpet.
Area 4
the equation for area is area = length * width. area = 3cm*4cm. Area = 12cm^2
Divide the area of the sector by 360 and multiply it to the area. The area of the sector is 5 square inches.