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Area and perimeter word problem: table dimensions | Khan Academy - YouTube
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Perimeter & area (video) | Area | Khan Academy
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Perimeter Worksheet for 3rd Grade Geometric Shapes area and Perimeter
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Area/Perimeter - GRE 4th Grade Website
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Area/Perimeter - GRE 4th Grade Website
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Perimeter of a rectangle using variables | Algebra | Class 6 (India