周长, Perimeter, 面积, Area, 长（长方形）, Length, 宽（长方形）, Width, 边长, Side Length, 长方形, Rectangle, 正方形, Square, 图形, Shape, 边界, Boundary, 阴影部分, Shaded Part, 空白部分, Unshaded Part, 数格子, Count Squares, 平方厘米, Square Centimeter (cm²), 厘米, Centimeter (cm), 米（长度）, Meter (m), 增加, Increase, 减少, Decrease, 比较, Compare, 计算, Calculate

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