锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷e锟斤拷式锟斤拷S=a×h/2锟斤拷锟斤拷式锟斤拷锟斤拷锟斤拷锟斤拷式锟斤拷a锟斤拷锟斤拷锟斤拷锟轿的底ｏ拷h锟斤拷锟斤拷锟斤拷锟斤拷锟�(y锟斤拷ng)锟侥革拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷e锟斤拷式锟斤拷指使锟斤拷锟斤拷式計锟斤拷锟斤拷锟斤拷锟斤拷蔚锟斤拷锟絜锟斤拷同一平锟斤拷锟�(n锟斤拷i)锟斤拷锟揭诧拷锟斤拷同一直锟斤拷锟斤拷锟斤拷锟絣锟斤拷锟斤拷锟斤拷尾順达拷锟斤拷锟斤拷锟斤拷M锟缴的凤拷锟絔锟紻锟轿斤拷锟斤拷锟斤拷锟斤拷锟轿ｏ拷锟斤拷號锟斤拷锟�锟斤拷

锟斤拷锟斤拷1锟斤拷锟斤拷锟斤拷锟斤拷e锟斤拷式

锟斤拷锟斤拷1.锟斤拷知锟斤拷锟斤拷锟轿碉拷a锟斤拷锟斤拷h锟斤拷锟絫S=a*h/2

锟斤拷锟斤拷2.锟斤拷知锟斤拷锟斤拷锟斤拷锟斤拷邊a,b,c锟斤拷锟絫

锟斤拷锟�锟斤拷锟斤拷锟斤拷锟斤拷锟绞斤拷锟斤拷锟絧=锟斤拷a+b+c锟斤拷/2锟斤拷

锟斤拷锟斤拷S=sqrt[p(p-a)(p-b)(p-c)]

锟斤拷锟斤拷=sqrt[(1/16)(a+b+c)(a+b-c)(a+c-b)(b+c-a)]

锟斤拷锟斤拷=1/4sqrt[(a+b+c)(a+b-c)(a+c-b)(b+c-a)]

锟斤拷锟斤拷3.锟斤拷知锟斤拷锟斤拷锟轿冿拷邊a,b,锟紷锟斤拷邊锟紸锟斤拷C锟斤拷锟絫S=(absinc)/2锟斤拷锟斤拷锟缴夾邊之锟絜锟剿夾锟角碉拷锟斤拷锟斤拷值锟斤拷

锟斤拷锟斤拷4.锟絆(sh锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷邊锟街別锟斤拷a锟斤拷b锟斤拷c锟斤拷锟斤拷(n锟斤拷i)锟叫圓锟诫徑锟斤拷r

锟斤拷锟斤拷锟絫锟斤拷锟斤拷锟斤拷锟斤拷eS=(a+b+c)r/2

锟斤拷锟斤拷5.锟絆(sh锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷邊锟街別锟斤拷a锟斤拷b锟斤拷c锟斤拷锟斤拷訄A锟诫徑锟斤拷R

锟斤拷锟斤拷锟絫锟斤拷锟斤拷锟斤拷锟斤拷e=abc/4R

锟斤拷锟斤拷S=2R2·sinA·sinB·sinC

锟斤拷锟斤拷2锟斤拷锟斤拷锟轿碉拷锟斤拷锟絴(zh锟斤拷)

锟斤拷锟斤拷1锟斤拷锟斤拷平锟斤拷锟斤拷锟斤拷锟斤拷锟轿的冿拷(n锟斤拷i)锟角和碉拷锟斤拷180°锟斤拷锟斤拷(n锟斤拷i)锟角和讹拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷2锟斤拷锟斤拷平锟斤拷锟斤拷锟斤拷锟斤拷锟轿碉拷锟斤拷呛偷锟斤拷锟�360°(锟斤拷呛投锟斤拷锟�)锟斤拷

锟斤拷锟斤拷3锟斤拷锟斤拷平锟斤拷锟斤拷锟斤拷锟斤拷锟轿碉拷锟斤拷堑锟斤拷锟斤拷c锟戒不锟斤拷锟斤拷锟侥兩傦拷锟斤拷(n锟斤拷i)锟斤拷之锟酵★拷

锟斤拷锟斤拷锟斤拷論锟斤拷锟斤拷锟斤拷锟轿碉拷一锟斤拷锟斤拷谴锟斤拷锟斤拷魏锟揭伙拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷膬锟�(n锟斤拷i)锟斤拷锟斤拷

锟斤拷锟斤拷4锟斤拷一锟斤拷锟斤拷锟斤拷锟轿碉拷锟斤拷锟斤拷锟斤拷(n锟斤拷i)锟斤拷锟斤拷锟斤拷锟斤拷锟叫兩傦拷锟絁锟斤拷锟斤拷

锟斤拷锟斤拷5锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷锟角达拷锟节碉拷锟斤拷60锟斤拷锟斤拷也锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷小锟节碉拷锟斤拷60锟斤拷锟斤拷

锟斤拷锟斤拷6锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟竭呏�锟酵达拷锟节碉拷锟斤拷邊锟斤拷锟斤拷锟斤拷锟竭呏�锟斤拷小锟节碉拷锟斤拷邊锟斤拷

锟斤拷锟斤拷7锟斤拷锟斤拷一锟斤拷直锟斤拷锟斤拷锟斤拷锟斤拷锟叫ｏ拷锟斤拷一锟斤拷锟角碉拷锟斤拷30锟斤拷锟斤拷锟絫30锟饺斤拷锟斤拷锟斤拷锟斤拷直锟斤拷邊锟斤拷斜邊锟斤拷一锟斤拷锟斤拷

锟斤拷锟斤拷8锟斤拷直锟斤拷锟斤拷锟斤拷锟轿的兩條直锟斤拷邊锟斤拷平锟斤拷锟酵碉拷锟斤拷斜邊锟斤拷平锟斤拷锟斤拷锟斤拷锟缴讹拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟缴讹拷锟斤拷锟芥定锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷蔚锟斤拷锟竭咃拷La锟斤拷b锟斤拷c锟組锟斤拷a2+b2=c2锟斤拷锟斤拷么锟紷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷直锟斤拷锟斤拷锟斤拷锟轿★拷

锟斤拷锟斤拷9锟斤拷直锟斤拷锟斤拷锟斤拷锟斤拷斜邊锟斤拷锟叫撅拷锟斤拷锟斤拷斜邊锟斤拷一锟斤拷锟斤拷

锟斤拷锟斤拷10锟斤拷锟斤拷锟斤拷锟轿碉拷锟斤拷锟絣锟斤拷平锟街撅拷锟斤拷锟斤拷一锟絚锟斤拷锟斤拷锟絣锟竭撅拷锟斤拷锟斤拷锟斤拷直锟斤拷锟斤拷锟斤拷一锟絚锟斤拷锟斤拷锟絣锟叫撅拷锟斤拷锟斤拷一锟絚锟斤拷

锟斤拷锟斤拷11锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絣锟叫撅拷锟斤拷锟絃锟饺碉拷平锟斤拷锟酵碉拷锟斤拷锟斤拷锟斤拷锟斤拷邊锟斤拷锟絃锟斤拷平锟斤拷锟酵碉拷3/4锟斤拷

锟斤拷锟斤拷12锟斤拷锟饺碉拷同锟竭碉拷锟斤拷锟斤拷锟斤拷锟斤拷e锟斤拷锟�锟斤拷

锟斤拷锟斤拷13锟斤拷锟斤拷锟斤拷鹊锟斤拷锟斤拷锟斤拷蔚锟斤拷锟絜之锟饺碉拷锟斤拷锟斤拷锟街�锟斤拷锟斤拷锟斤拷锟斤拷鹊锟斤拷锟斤拷锟斤拷蔚锟斤拷锟絜之锟饺碉拷锟斤拷锟斤拷锟街�锟斤拷锟斤拷

锟斤拷锟斤拷14锟斤拷锟斤拷锟斤拷锟轿碉拷锟斤拷锟斤拷一锟絣锟叫撅拷锟斤拷锟紷锟斤拷锟斤拷锟斤拷锟轿分烇拷蓚锟斤拷锟絜锟斤拷鹊锟斤拷锟斤拷锟斤拷锟�锟斤拷

锟斤拷锟斤拷15锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷頂角的斤拷平锟街撅拷锟酵碉拷邊锟较的高★拷锟斤拷邊锟较碉拷锟叫撅拷锟斤拷一锟絣直锟斤拷锟较ｏ拷锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷

锟斤拷锟斤拷16锟斤拷锟斤拷同一锟斤拷锟斤拷锟斤拷锟轿冿拷(n锟斤拷i)锟斤拷锟斤拷邊锟斤拷锟斤拷牵锟斤拷锟角岋拷锟斤拷邊锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷,锟斤拷锟叫斤拷α,β,γ锟街別锟斤拷锟斤拷邊a,b,c锟斤拷

锟斤拷锟斤拷17锟斤拷锟斤拷锟斤拷锟轿撅拷锟叫凤拷(w锟斤拷n)锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟絇(gu锟斤拷n)锟斤拷锟絔锟斤拷

锟斤拷锟斤拷锟竭匡拷锟斤拷(sh锟斤拷)锟絎(xu锟斤拷)知锟絉锟絚锟絉锟斤拷

锟斤拷锟斤拷平锟斤拷锟絕直锟斤拷锟斤拷指直锟斤拷锟斤拷平锟斤拷锟较嗭拷锟斤拷

锟斤拷锟铰高匡拷锟結訊锟斤拷锟竭匡拷锟斤拷锟竭★拷锟斤拷前锟绞傦拷锟斤拷志愿锟斤拷锟�锟斤拷锟饺★拷謹锟�(sh锟斤拷)锟斤拷锟斤拷

锟竭匡拷锟絩锟絞锟斤拷锟斤拷全锟斤拷锟斤拷要锟斤拷(ji锟斤拷)锟絚

锟組锟斤拷"锟竭匡拷锟絎(w锟斤拷ng)"微锟脚癸拷锟斤拷號