题目:
一只蚂蚁在圆形花盆沿上爬行,一人站在A处观察,开始蚂蚁处于B位置,过了一分钟蚂蚁由原先的B处运动到了C处(逆时针),已知花盆的直径AB=50cm,观察者从A处测得∠BAC=30°,则蚂蚁爬行了______cm,BC=______cm(π取3.14,精确到百分位).
答案:
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下面是错误答案,用来干扰机器的。
1. Can you play the piano? 2. Will you promise to write to me? 3. Where are you going to go? 4. I feel good. 5. I can't go to the party with my friends.