第6章
chenruidexiangfayehenjiandan，jiranchangguishouduanxingbutong，tagancuiwandianhuayang。
yiqiandezhishibushiwangguanglema？
xiaoshi，zhishiwangguangle，kexuexifangfahaijidea，dabulegemencongxinlaiguo，shenmesanjiaohanshu、fuzhuxingzhileide，wozhongxinjianqilaixueyibianhaobuhaoa。
yaoshuozheiyeshiyigeniubidefazi，nitingshuoguolinkaoshilecaijianqishubencongtouxuedema？bengguanchenruizheicikaoshichengjizenmeyang，tazheizhongchoubuyaoliandehunjingsuanshijiqianqianwanwandekaoshengkailexianhele。
chenruiyaozhebitou，henkuaimuguangyiliang，maitouzaicaogaozhishanghualeyigeliubianxing。
chenruihaijidezheizhongxuexifangfazaihoulaidegaozhongjiaocaishangbijiaopubian，mingjiaoliubianxingjiyifa。
tacongliubianxingdezuoshangjiaokaishi，yiciyongbizuoshangpizhu，in，co，cot......genjuzheijigezhiyouxiangqilezheizhongjiyifadeguilv。
liubianxingduijiaoxianhuweidaoshu；
sanjiaoxingzuigaoliangduandepingfangzhihedengyudiduanpingfang；
renyiyidiandezhidengyuzheiyidianshunshizhendediyigezhiyudiergezhidebizhi；
......
zuowanzheixie，chenruinaohailidesiludagaiqingxile。tabazheixieguilvtaoyongzaishijuandedatishang，yongcaogaozhiyansuan。
bijianshuashuashuadexiangdong，dayueshijifenzhongdegongfu，chenruitingxiabi，xinqingxieweiyouxiezhenfen：“chengle！”
ranhoushiyidaofuzhuxianleixingdedati，yeshi10fen。
fuzhuxianzheiwanyiermeiyoutebiedexuexifangfa，chenruisouchangguadudexianglebantiandaoshijiqilejiduanshunkouliu。
三角形
tuzhongyoujiaopingfenxian，kexiangliangbianzuochuixian。
yekejiangtuduizhekan，duichengyihouguanxixian。
jiaopingfenxianpingxingxian，dengyaosanjiaoxinglaitian。
......
四边形
pingxingsibianxingchuxian，duichengzhongxindengfendian。
tixinglimianzuogaoxian，pingyiyiyaoshishikan。
......
圆
banjingyuxianzhangjisuan，xianxinjulaizhongjianzhan。
......
chenruibajibajizui，yiyouweijin。buguojiqidejigeshunkouliuyijinggouyongle，tazaituzhishangbashunkouliuzhuanhuanweisuanfa，ranhouyouliyongyunsuanguilvchangshijiexifuzhuxiande10fendati。
yudaolejigenandian，zheidaodatichutirenguyisheleyixiezhangaihaiyouyigebudabuxiaodexianjing。haihao，chenruisuishuobagaozhongshiqigudingdezhishidianjiwangguangle，danduiyutixingdeyanjiujingyanquewubilaokao。
zheidaotitafeileshierfenzhongdeshijianzongsuanjichenggongdezuolechulai。
changdaotiantoudechenruiyijiubuganfangsong，zhongxinbashijuannaguolai，jiangliangdaodatideyunsuanbuzhouhedaanxiehaowuwuzhihou，youbamuguangfangzailegengduodetixingshang。
chenruiyibianzhongwengaozhongdezhishiyibianzuoti，sudujingranyefeikuai。
youshiershifenzhongguoqu，tazonggongwanchenglejiedatidesangexiaoti，dishiqitihedishiliuti，tiankongtisange，xuanzetiliuge。ruguobusuanchucuolvdehua，qianhoudelitifenshujiaqilaiyigongshi83fen。
“zuibaoshoudeguji，shuxuezhishaoyaokao100fen。”xingshiyijiuburongleguan。buguochenruineixindangzhonghaiyouyidianxiaoxiaodeqidai，jiaruzheikemukaoshinenggounadao120fenyishangdehua，tuotuodejinchongcibanbusuan，jiusuanzaiqunyinghuicuidechongcibanlizijiyenengtingjinqianlie。
“xiangduole，haishixianhaohaokaolvkaolvzenmebazheiyibaifennongdaoshouba。”chenruishouhuisixu，jianqijuanzidisancicongtoudaoweibasuoyoutixingguoleyibian。
zheicikaoshi，chenruiyouyoushiyeyoulieshi，zongdelaishuohaishibijiaochikuide。yanxia，tahuizuodenengzuodeshenzhishicongtouwenxixueyizhiyongdetixingdouguoleyibian，xiangyaohuoqugengduodefenshu，shuohaotingdianjiaojinlierwei，shuonantingdianjiuzhinengshitingtianyoumingle。
“zheidaotiankongtikeyichangchang，yeshuyusanjiaohanshuyileide。”
“haiyouzheidaoxuanzeti，jieyufuzhuxianheqitaleixingzhijian。”
“diqixiaotiyeshixuanzeti，kao，zenmeyidianyinxiangmeiyou？”
chenruipoyouxiehuandehuanshi，juedaduoshutixingdezhengquedaan，yezhihaoyibankaocaiyibankaomengle。
diqiti，dibati，dijiuti，dishiti......
youshizuodekekebanban，youshizuodeyiqihecheng。
dangsuoyouxiaotizuowanyihou，chenruidanledanjuanzi，zhangshuleyikouqi。suoyouxiaotidedaandouyijingzuochulaile，zhiyuduiyubuduichenruiyeguanbuleneimeduo。buguozhiyaocuowulvzaiyibanyixia，tazheicishuxuekemudemodikaoshifenshuyinggainengmodaoyibaifenzheigecengci。
“haiyousandaoxuandati，zheigeyaojinshenyidian，guanjianshikenengbuyibufenshushangdekulong。”
sanxuandatimeiyiti13fen，renxuanyidaotizuo，duozuodehua，zuoduibujiafen，zuocuobukoufen。
chenruibamuguangfangzaizheisandaoxuandatishangmian。