Maths problem, how to fo, thanks?
回答 (1)
2020-07-21 1:16 pm
✔ 最佳答案
設圓心為O.半徑 = OD = OA = 34/2 = 17(cm)OE = 17 - 2 = 15(cm)
DE = √(17^2-15^2) = 8(cm)
□CDEF 是長方形, ∴ EF = 2OE = 30(cm)
a□CDEF = EF × DE = 30 ×8 = 240(cm^2)
收錄日期: 2021-04-24 07:53:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200721042737AANvPRd