Maths problem: how to do (c), thanks?
回答 (1)
2020-07-21 1:09 pm
✔ 最佳答案
因 角DCB = 角CBD = 36度故 CD = BD
若 CD = DE 則
角DBE = 角DEB = (180度-72度)/2 = 54度
收錄日期: 2021-04-24 07:54:12
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20200721032301AA8TD2E