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推第四个顶点 = cari bucu keempat 把三个点画在方格上，看看哪一个角空着。空着的角和其中一个点在同一条竖线上，和另一个点在同一条横线上，分别借它们的数字。 例子：(0, 0)、(2, 0)、(2, 2) 的第四个顶点是 (0, 2)。 注意：最后数四条边，都一样长才对。

finding the fourth vertex = cari bucu keempat Plot the three points and see which corner is empty. That corner shares a vertical line with one point and a horizontal line with another; borrow a number from each. Example: the fourth vertex of (0, 0), (2, 0), (2, 2) is (0, 2). Watch out: finally count all four sides; they must be equal.

长方形缺的顶点 = bucu segi empat tepat yang tiada 长方形的边也是横的和竖的。缺的顶点在某一个已知点的正上方，第一个数字借它；又和另一个已知点在同一条横线上，第二个数字借它。 例子：(1, 1)、(4, 1)、(1, 2) 的第四个顶点是 (4, 2)。 注意：长方形只要对边一样长。

the missing vertex of a rectangle = bucu segi empat tepat yang tiada A rectangle's sides are also horizontal and vertical. The missing vertex is straight above one known point, so it borrows that first number; it also shares a horizontal line with another known point, so it borrows that second number. Example: the fourth vertex of (1, 1), (4, 1), (1, 2) is (4, 2). Watch out: a rectangle only needs opposite sides to be equal.

算边长 = kira panjang sisi 横边的长度，就是两个顶点第一个数字的差；竖边的长度，就是两个顶点第二个数字的差。先选一条横边来算。 例子：从 (2, 4) 到 (7, 4) 的横边长 7 − 2 = 5 格。 注意：是相减，不是相加。

working out a side length = kira panjang sisi The length of a horizontal side is the difference between the two first numbers; a vertical side uses the difference between the second numbers. Pick a horizontal side first. Example: the horizontal side from (2, 4) to (7, 4) is 7 − 2 = 5 units. Watch out: subtract; do not add.