Maths problem: how to do (b), thanks?
回答 (1)
2021-04-02 5:28 pm
✔ 最佳答案
(a)AB² = AC² + BC² (畢氏定理)
AB² = 4² + 3² = 16 + 9 = 25
AB = 5 cm
(b)
CD = AE = 5 cm
BD = BC + CD = 3 + 5 = 8 cm
BE² = BD² + ED² (畢氏定理)
BE² = 8² + 4² = 64 + 16 = 80
BE = √80 = √(16 × 5) = 4√5 cm
收錄日期: 2021-05-04 00:38:50
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https://hk.answers.yahoo.com/question/index?qid=20210402084629AAE4C9Z