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计算图形的面积是几何问题中一种重要题型 ,解决这类问题除了掌握必要的面积公式之外 ,等积定理和等比定理也是必须掌握的重要知识 .等积定理 等底等高的两个三角形面积相等 .等比定理 同底 (或等底 )两个三角形面积之比等于对应高之比 ;同高 (或等高 )的两个三角形面积之比
Calculating the area of a graph is an important problem in geometric problems. To solve such problems, in addition to the necessary area formulas, the equal-area theorem and the equal-ratio theorem are important knowledge that must be mastered. The triangles have the same area. The ratio theorem equals the ratio of the two triangles at the bottom (or equivalent) equal to the ratio of the corresponding heights; the ratio of the two triangles with the same height (or equal height)