2. 外语
  3. The ratio of the two legs of a right triangle is 1 to 7. If the length if the hypotenuse of the triangle is , then the perimeter

The ratio of the two legs of a right triangle is 1 to 7. If the length if the hypotenuse of the triangle is , then the perimeter

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问题 The ratio of the two legs of a right triangle is 1 to 7. If the length if the hypotenuse of the triangle is , then the perimeter of the triangle is between
选项 A、31 and 32
B、30 and 31
C、29 and 30
D、28 and 29
E、27 and 28
答案B
解析 由勾股定理，直角三角形三边之比为1：7：。已知斜边为，那么两个直角边为2和14，周长为16+≈30.14，故答案为B。
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