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1 是一个图形，有个圆形内有两条弦互相平行，且长度相等，求圆形内的这两条弦所围成的面积是多少?弦的长度是根号2，这两条弦的中点连成一条线，长度也是根号2。
2 一个书店卖新书和二手书。新书一本卖13元，旧书一本卖5元，有一个学生共买了67元。书店卖一本新书的利润是成本的30%，旧书的利润是100%，求书店卖给这个学生赚得的利润是多少?
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