Re: [問卦] 國小這題面積題好難消失
解法就是利用，二圓相交可以求彼此內角，
得到大扇形與小扇形，再用小扇形-(大扇形-2個三角形）得解，
我是沒算出最後答案，但小學考這題。。。
感覺要用三角函數之類的，不知有沒有更好解
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