angle/360 * 兀r^2 = area of the circle
(angle/360) is in degree measure
請問如何把這兩條式轉成radian measure
即 r 0 和 1/2rs
thx
更新1:
多問一下 r rad. 可以和 r cm 相約掉嗎?
radian
2007-12-23 3:11 am
angle/360 * 2兀r = arc legnth
angle/360 * 兀r^2 = area of the circle
(angle/360) is in degree measure
請問如何把這兩條式轉成radian measure
即 r 0 和 1/2rs
thx
angle/360 * 兀r^2 = area of the circle
(angle/360) is in degree measure
請問如何把這兩條式轉成radian measure
即 r 0 和 1/2rs
thx
回答 (1)
2007-12-23 3:23 am
✔ 最佳答案
arc:2πr x θ/360
=2πr x θ/(2π)
=rθ//
Area:
=πr^2 x θ/360
=πr^2 x θ/(2π)
=(1/2)(r^2)θ
=>since s=rθ
so
=>(1/2)(r^2)θ
=>(1/2)(r)(rθ)
=>(1/2)rs//
收錄日期: 2021-04-23 17:33:29
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071222000051KK03498