请问半圆的周长和面积的计算公式是什么???
\u534a\u5706\u7684\u5468\u957f\u9762\u79ef\u516c\u5f0f\u662f\u4ec0\u4e48\uff1f\u56e0\u4e3a\u534a\u5706\u7684\u5468\u957f\u5e76\u4e0d\u662f\u6574\u4e2a\u5706\u7684\u5468\u957f\u7684\u4e00\u534a\uff0c\u800c\u662f\u6574\u4e2a\u5706\u7684\u5468\u957f\u7684\u4e00\u534a+\u76f4\u5f84\uff08\u4e24\u4e2a\u534a\u5f84\uff09\uff0c
\u6240\u4ee5\u534a\u5706\u5468\u957f=\u76f4\u5f84\u00d73.14\u00f72+\u76f4\u5f84\uff08\u534a\u5f84\u00d72\u00d73.14\u00f72+\u534a\u5f84\u00d72\uff09\u3002
\u534a\u5706\u7684\u9762\u79ef\u5219\u662f\u6574\u4e2a\u5706\u7684\u9762\u79ef\u7684\u4e00\u534a\uff0c\u6240\u4ee5\u534a\u5706\u7684\u9762\u79ef=\u534a\u5f84\u00d7\u534a\u5f84\u00d73.14\u00f72
c=\u03c0d=2\u03c0r \u5706\u7684\u5468\u957f=\u76f4\u5f84\u00d7\u5706\u5468\u7387
s=\u03c0rr \u5706\u7684\u9762\u79ef=\u534a\u5f84\u00d7\u534a\u5f84\u00d7\u5706\u5468\u7387
面积= 1/2 * 派 * 半径平方
周长:圆的周长的一半+直径
面积:圆的面积的一半
半径*派=半圆弧长.
面积=派R平方/2.
小学阶段只要用c=5.14r就可以了,方便快捷容易识记
C=(pai+2)r
S=pai*r^2/2
绛旓細鍛ㄩ暱 = 娲*鍗婂緞 + 2*鍗婂緞 闈㈢Н= 1/2 * 娲 * 鍗婂緞骞虫柟
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