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1数学实验笔者在高二开设了数学选修课《数学实验》,其中特意选取《普通高中课程标准试验教科书》《必修二》(苏教版)上的一道操作题做实验.用硬纸剪一个三边均不相等的锐角三角形AOB,然后以AB边上的高OO′为折痕,折得两个直角三角形,使之直立于桌面α上(如图1),那么∠AO′B就是∠AOB在桌面上的射影,转动其中一个直角三角形,观察∠AOB与∠AO′B的大小关系,是否存在某个位置,使得∠AOB=∠AO′B?
A mathematical experiment I was in sophomore set up mathematics elective course “mathematics experiment”, which deliberately selected “ordinary high school curriculum standard textbook” “compulsory two” (Sujiao version) on an operation problem to do experiments with cardboard cut a three Edges are not equal acute triangle AOB, and then to the edge of the high OO ’for the crease, fold two right triangle, make it upright on the desktop α (Figure 1), then ∠ AOB is ∠ AOB Projection on the desktop, turn one of the right triangle, observe 大 AOB and ∠ AO’B the size of the relationship between the existence of a location, making ∠ AOB = ∠ AO’B?