证明园中的线段比例式（或等积式）是一类综合性较强的几何证明题．证明这类命题要综合应用相似形和圆的有关知识和方法，同时还需要作适当的等量代换．所以它成为全国各省市中考命题的重点和热点．例如1997年全国各省市的中考试题中，就有32个省市命了这类试题，即约大部分省? Prove that the proportion of the line segment in the park (or isointegration) is a kind of comprehensive geometric proof. Prove that such propositions should apply the relevant knowledge and methods of similar shapes and circles, and also need to make appropriate equal substitution. Therefore, it has become the focus and hot spot of the national examination proposition in all provinces and cities. For example, in the mid-test questions of all provinces and cities across the country in 1997, 32 provinces and municipalities ordered such questions, that is, about most provinces?