提一个问题(数学)摘自OG 13 的5 problem solving 的practice question 75题: 请问equidistant from vertices 是什么意思?另外解析里划了一条辅助线,请问如果不用辅助线只在三角形内画高可以,看角度为什么不对? 谢谢。 -- by 会员 Stonebutch (2012/10/3 23:50:18)
In the figure above, triangle ABC is equilateral, and point P is equidistant from vertices A, B, and C. If triangle ABC is rotated clockwise about point P, what is the minimum number of degrees the triangle must be rotated so that point B will be in the position where point A is now?
在等边三角形ABC中,P点到端点A,B,C的距离相等。如果将该三角形以P点为中心进行顺时钟旋转,那么B点会落在曾经三角形A点位置上,求顺时钟旋转的最小角度值。
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