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方格上的直角三角形 = segi tiga bersudut tegak pada grid 数出底边有几格，再数竖直的那条直角边有几格，它就是高。用二分之一乘底乘高，单位是平方单位。也可以想成它是一个长方形的一半。 例子：底 7 格、高 4 格的直角三角形，面积 = ½ × 7 × 4 = 14 unit²。 注意：数的是格子的边长，不是格点的个数。

right-angled triangle on a grid = segi tiga bersudut tegak pada grid Count the squares along the base, then along the upright side, which is the height. Use ½ × base × height in square units. You can also think of it as half of a rectangle. Example: a right-angled triangle with a 7-square base and a 4-square height has an area of ½ × 7 × 4 = 14 unit². Watch out: count square sides, not grid dots.

两个三角形比较 = banding luas dua segi tiga 两个三角形的底和高都不同，要分别代入二分之一乘底乘高，算出两个面积，再比较大小或是否相等。 例子：底 8 cm、高 3 cm 的三角形是 12 cm²，底 5 cm、高 4 cm 的是 10 cm²，前者比较大。 注意：底比较长的那一个，面积不一定比较大。

comparing two triangles = banding luas dua segi tiga The two triangles have different bases and heights, so use ½ × base × height for each, then compare the two areas. Example: a triangle with base 8 cm and height 3 cm is 12 cm², while one with base 5 cm and height 4 cm is 10 cm², so the first is bigger. Watch out: the triangle with the longer base does not always have the bigger area.

同底同高 = tapak sama, tinggi sama 三角形的面积由底和高决定。题目没有给数字，要从文字里找线索：底有什么关系？顶点所在的线和底是什么关系？想一想平行线之间的距离有什么特点，就能判断两个高的关系。 例子：两个三角形底都是 6 cm，但一个高 4 cm、一个高 5 cm，面积是 12 cm² 和 15 cm²，不相等，所以一定要比较高。 注意：只知道底一样还不够，高也要比较。

same base, same height = tapak sama, tinggi sama A triangle's area depends on its base and height. No numbers are given for them, so look for clues in the words: how are the bases related, and how is the line through the top corners related to the base? Think about what is special about the distance between parallel lines. Example: two triangles both have a 6 cm base, but one is 4 cm high and the other 5 cm high, so their areas are 12 cm² and 15 cm², not equal; the heights must be compared. Watch out: equal bases alone are not enough; compare the heights too.