锟斤拷锟斤拷锟斤拷锟叫旓拷(sh锟斤拷)锟絎知锟絉锟絚锟叫很讹拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絚锟斤拷锟斤拷(sh锟斤拷)锟斤拷锟斤拷锟斤拷锟角猴拷锟斤拷(sh锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷式锟斤拷锟斤拷锟斤拷(sh锟斤拷)锟叫★拷锟斤拷锟酵旓拷(sh锟斤拷)锟斤拷锟斤拷锟斤拷锟叫★拷锟組锟斤拷锟斤拷锟斤拷锟绞斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷w锟阶何★拷锟斤拷平锟斤拷锟斤拷锟斤拷缀巍锟斤拷锟�锟斤拷

锟斤拷锟斤拷1锟斤拷锟叫旓拷(sh锟斤拷)锟絎知锟絉锟絚锟斤拷锟結(ji锟斤拷)

锟斤拷锟斤拷一锟斤拷锟紸锟斤拷锟紸锟斤拷锟斤拷锟絇锟斤拷锟侥讹拷锟絰

锟斤拷锟斤拷1.平锟斤拷锟较碉拷锟斤拷锟絚锟侥撅拷锟絰锟斤拷锟节讹拷锟絃锟斤拷锟斤拷锟斤拷锟絚锟組锟缴的圖锟轿斤拷锟斤拷锟紸锟斤拷锟斤拷锟絚锟絈锟斤拷A锟斤拷锟斤拷锟斤拷锟絃锟絈锟斤拷霃�锟斤拷

锟斤拷锟斤拷2.锟紸锟斤拷锟斤拷锟斤拷锟斤拷c锟絞锟侥诧拷锟街斤拷锟斤拷锟紸锟斤拷锟斤拷锟斤拷锟絈锟斤拷锟斤拷锟斤拷锟节帮拷A锟侥伙拷锟絈锟介優(y锟斤拷u)锟斤拷锟斤拷小锟节帮拷A锟侥伙拷锟絈锟斤拷锟接伙拷锟斤拷锟紹锟接圓锟斤拷锟斤拷锟斤拷锟斤拷c锟侥撅拷锟轿斤拷锟斤拷锟斤拷锟斤拷锟斤拷(j锟斤拷ng)锟絕锟紸锟侥碉拷锟揭斤拷

锟斤拷锟斤拷锟斤拷直锟斤拷锟斤拷

锟斤拷锟斤拷3.锟斤拷c锟节圓锟斤拷锟较的角斤拷锟斤拷锟紸锟侥斤拷锟斤拷锟斤拷c锟节圓锟斤拷锟较ｏ拷锟斤拷锟斤拷锟侥冿拷邊锟街別锟絚锟紸锟斤拷锟斤拷一锟斤拷锟斤拷锟絚锟侥角斤拷锟斤拷锟紸锟杰斤拷锟斤拷

锟斤拷锟斤拷4.锟絕锟斤拷锟斤拷锟轿碉拷锟斤拷锟斤拷锟斤拷c锟侥圓锟斤拷锟斤拷锟斤拷锟斤拷锟轿碉拷锟斤拷訄A锟斤拷锟斤拷A锟侥斤拷锟斤拷锟斤拷锟斤拷锟轿碉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邊锟斤拷锟斤拷锟叫的圓锟斤拷锟斤拷锟紷锟斤拷锟斤拷锟斤拷锟轿的冿拷(n锟斤拷i)锟叫圓锟斤拷锟斤拷A锟侥稱锟斤拷锟�(n锟斤拷i)锟斤拷锟斤拷

锟斤拷锟斤拷5.直锟斤拷锟絚锟紸锟斤拷3锟絅位锟斤拷锟絇系锟斤拷锟給锟斤拷锟斤拷锟絚锟斤拷锟斤拷锟絰;锟斤拷2锟斤拷锟斤拷锟斤拷锟絚锟斤拷锟洁交;锟紸锟絚直锟斤拷锟斤拷唯一锟斤拷锟斤拷锟絚锟斤拷锟斤拷锟斤拷锟斤拷锟紷锟絣直锟斤拷锟斤拷锟斤拷锟紸锟斤拷锟叫撅拷锟斤拷锟紷锟斤拷唯一锟侥癸拷锟斤拷锟絚锟斤拷锟斤拷锟斤拷锟絚锟斤拷

锟斤拷锟斤拷6.锟缴圓之锟絞锟斤拷5锟絅位锟斤拷锟絇系锟斤拷锟給锟斤拷锟斤拷锟絚锟侥ｏ拷一锟紸锟斤拷锟斤拷一锟紸之锟斤拷锟斤拷锟斤拷x锟斤拷锟斤拷之锟斤拷(n锟斤拷i)锟叫冿拷(n锟斤拷i)锟斤拷;锟斤拷唯一锟斤拷锟斤拷锟絚锟侥ｏ拷一锟紸锟斤拷锟斤拷一锟紸之锟斤拷锟斤拷锟斤拷锟�锟斤拷锟斤拷之锟斤拷(n锟斤拷i)锟叫冿拷(n锟斤拷i)锟斤拷;锟斤拷2锟斤拷锟斤拷锟斤拷锟絚锟侥斤拷锟洁交锟斤拷锟缴圓锟紸锟斤拷之锟絞锟侥撅拷锟絰锟斤拷锟斤拷锟紸锟侥撅拷锟斤拷

锟斤拷锟斤拷7.锟节圓锟斤拷锟斤拷锟斤拷2锟絣锟诫徑锟斤拷一锟轿伙拷锟斤拷锟缴的圖锟轿斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟紸锟紽锟斤拷(c锟斤拷)锟斤拷展锟絖锟紻锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷锟紷锟斤拷锟斤拷锟轿的半徑锟缴烇拷A锟紽锟斤拷母锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絇锟紸锟斤拷锟斤拷母锟斤拷示锟斤拷锟斤拷

锟斤拷锟斤拷锟紸--锟斤拷 锟诫徑—r 锟斤拷--锟斤拷 直锟斤拷—d

锟斤拷锟斤拷锟斤拷锟轿伙拷锟絃/锟紸锟紽母锟斤拷—l 锟斤拷锟絃—C 锟斤拷e—S锟斤拷锟斤拷锟斤拷锟絇锟紸锟侥伙拷锟斤拷锟斤拷锟絴(zh锟斤拷)锟絚锟斤拷锟斤拷(27锟斤拷)

锟斤拷锟斤拷1.锟絚P锟絚锟紸O锟斤拷位锟斤拷锟絇系(锟絆P锟斤拷一锟絚锟斤拷锟絫PO锟斤拷锟絚锟斤拷锟紸锟侥的撅拷锟絰)锟斤拷

锟斤拷锟斤拷P锟节★拷O锟斤拷锟斤拷PO>r;P锟节★拷O锟斤拷锟斤拷PO=r;P锟节★拷O锟斤拷(n锟斤拷i)锟斤拷PO

锟斤拷锟斤拷2.锟紸锟斤拷锟絊锟斤拷锟絈锟紻锟轿ｏ拷锟戒對锟絈锟絊锟斤拷锟斤拷锟斤拷一锟絣锟絕锟紸锟侥碉拷直锟斤拷锟斤拷锟紸也锟斤拷锟斤拷锟侥岋拷锟絈锟紻锟轿ｏ拷锟戒對锟絈锟斤拷锟斤拷锟角圓锟斤拷锟斤拷

锟斤拷锟斤拷3.锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷直锟斤拷锟揭碉拷直锟斤拷平锟斤拷锟紷锟絣锟斤拷锟斤拷锟斤拷锟斤拷平锟斤拷锟斤拷锟斤拷锟斤拷锟侥伙拷锟斤拷锟芥定

锟斤拷锟斤拷锟斤拷锟斤拷平锟斤拷锟斤拷(锟斤拷锟斤拷直锟斤拷)锟斤拷直锟斤拷锟斤拷直锟斤拷锟揭ｏ拷锟斤拷锟斤拷平锟斤拷锟斤拷锟斤拷锟斤拷锟侥伙拷锟斤拷

锟斤拷锟斤拷4.锟斤拷同锟紸锟斤拷葓A锟叫ｏ拷锟斤拷锟�2锟斤拷锟紸锟侥斤拷锟斤拷2锟斤拷锟紸锟杰斤拷锟斤拷2锟絣锟斤拷锟斤拷2锟絣锟斤拷锟斤拷锟斤拷一锟組锟斤拷锟斤拷锟�锟斤拷锟斤拷么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M锟斤拷锟斤拷锟街別锟斤拷锟�锟斤拷

锟斤拷锟斤拷5.一锟絣锟斤拷锟斤拷锟斤拷锟侥圓锟杰角碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥圓锟侥角碉拷一锟斤拷锟斤拷

锟斤拷锟斤拷6.直锟斤拷锟斤拷锟斤拷锟侥圓锟杰斤拷锟斤拷直锟角★拷90锟饺的圓锟杰斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷直锟斤拷锟斤拷

锟斤拷锟斤拷7.锟斤拷锟斤拷同一直锟斤拷锟较碉拷3锟斤拷锟絚锟絖锟斤拷一锟斤拷锟紸锟斤拷

锟斤拷锟斤拷8.一锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷唯一锟絖锟斤拷锟斤拷锟斤拷訄A锟酵冿拷(n锟斤拷i)锟叫圓锟斤拷锟斤拷訄A锟紸锟斤拷锟斤拷锟斤拷锟斤拷锟轿革拷邊锟斤拷直平锟街撅拷锟侥斤拷锟絚锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷3锟斤拷锟斤拷c锟斤拷锟絰锟斤拷锟�;锟斤拷(n锟斤拷i)锟叫圓锟侥圓锟斤拷锟斤拷锟斤拷锟斤拷锟轿革拷锟斤拷(n锟斤拷i)锟斤拷平锟街撅拷锟侥斤拷锟絚锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷3邊锟斤拷锟絰锟斤拷锟�锟斤拷

锟斤拷锟斤拷9.直锟斤拷AB锟絚锟紸O锟斤拷位锟斤拷锟絇系(锟絆OP⊥AB锟斤拷P锟斤拷锟絫PO锟斤拷AB锟斤拷锟紸锟侥的撅拷

锟斤拷锟斤拷锟絰)锟斤拷

锟斤拷锟斤拷AB锟絚锟斤拷O锟斤拷锟絰锟斤拷PO>r;AB锟絚锟斤拷O锟斤拷锟叫ｏ拷PO=r;AB锟絚锟斤拷O锟洁交锟斤拷PO

锟斤拷锟斤拷10.锟紸锟斤拷锟叫撅拷锟斤拷直锟斤拷锟絕锟斤拷锟絚锟斤拷直锟斤拷;锟斤拷(j锟斤拷ng)锟絕直锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷锟揭达拷直锟斤拷锟紷锟絣直锟斤拷锟斤拷直锟斤拷锟斤拷锟斤拷锟紷锟斤拷锟紸锟斤拷锟叫撅拷锟斤拷

锟斤拷锟斤拷11.锟紸锟絚锟紸锟斤拷位锟斤拷锟絇系(锟絆锟缴圓锟侥半徑锟街別锟斤拷R锟斤拷r锟斤拷锟斤拷R≥r锟斤拷锟紸锟侥撅拷锟斤拷P)锟斤拷

锟斤拷锟斤拷锟斤拷锟絰P>R+r;锟斤拷锟斤拷P=R+r;锟洁交R-r

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絇锟紸锟斤拷計锟姐公式

锟斤拷锟斤拷1.锟紸锟斤拷锟斤拷锟絃C=2πr=πd

锟斤拷锟斤拷2.锟紸锟斤拷锟斤拷eS=s=πr?

锟斤拷锟斤拷3.锟斤拷锟轿伙拷锟絃l=nπr/180

锟斤拷锟斤拷4.锟斤拷锟斤拷锟斤拷eS=nπr? /360=rl/2

锟斤拷锟斤拷5.锟紸锟紽锟斤拷(c锟斤拷)锟斤拷eS=πrl

锟斤拷锟斤拷锟侥★拷锟紸锟侥凤拷锟斤拷

锟斤拷锟斤拷1.锟紸锟侥標準凤拷锟斤拷

锟斤拷锟斤拷锟斤拷平锟斤拷直锟斤拷锟斤拷锟斤拷系锟斤拷锟斤拷锟斤拷锟絚O(a,b)锟斤拷A锟侥ｏ拷锟斤拷r锟斤拷霃斤拷膱A锟侥標準凤拷锟斤拷锟斤拷

锟斤拷锟斤拷(x-a)^2+(y-b)^2=r^2

锟斤拷锟斤拷2.锟紸锟斤拷一锟姐方锟斤拷

锟斤拷锟斤拷锟窖圓锟侥標準凤拷锟斤拷展锟絖锟斤拷锟斤拷項ｏ拷锟较诧拷同锟巾椇锟�锟斤拷锟缴得圓锟斤拷一锟姐方锟斤拷锟斤拷

锟斤拷锟斤拷x^2+y^2+Dx+Ey+F=0

锟斤拷锟斤拷锟酵標準凤拷锟教岋拷锟斤拷锟斤拷锟戒實D=-2a,E=-2b,F=a^2+b^2

锟斤拷锟斤拷锟斤拷锟絇知锟絉锟斤拷锟紸锟斤拷锟絰锟斤拷锟斤拷e=0.锟节圓锟斤拷锟斤拷锟斤拷一锟絚锟斤拷锟斤拷锟绞半徑锟斤拷锟斤拷r.

锟斤拷锟斤拷锟斤拷锟斤拷锟紸锟絚直锟斤拷锟斤拷位锟斤拷锟絇系锟叫旓拷

锟斤拷锟斤拷平锟斤拷锟�(n锟斤拷i)锟斤拷直锟斤拷Ax+By+C=O锟絚锟紸x^2+y^2+Dx+Ey+F=0锟斤拷位锟斤拷锟絇系锟叫旓拷一锟姐方锟斤拷锟斤拷

锟斤拷锟斤拷討論锟斤拷锟斤拷2锟絅锟斤拷r锟斤拷

锟斤拷锟斤拷(1)锟斤拷Ax+By+C=O锟缴碉拷y=(-C-Ax)/B,[锟斤拷锟斤拷B锟斤拷锟斤拷锟斤拷0],

锟斤拷锟斤拷锟斤拷锟斤拷x^2+y^2+Dx+Ey+F=0,锟斤拷锟缴烇拷一锟斤拷锟絇锟斤拷x锟斤拷一元锟斤拷锟轿凤拷锟斤拷f(x)=0.

锟斤拷锟斤拷锟斤拷锟斤拷锟叫別式b^2-4ac锟侥凤拷號锟缴確锟斤拷锟紸锟絚直锟斤拷锟斤拷位锟斤拷锟絇系锟斤拷锟铰ｏ拷

锟斤拷锟斤拷锟斤拷锟絙^2-4ac>0,锟絫锟紸锟絚直锟斤拷锟斤拷2锟斤拷锟絚锟斤拷锟斤拷锟紸锟絚直锟斤拷锟洁交

锟斤拷锟斤拷锟斤拷锟絙^2-4ac=0,锟絫锟紸锟絚直锟斤拷锟斤拷1锟斤拷锟絚锟斤拷锟斤拷锟紸锟絚直锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟絙^2-4ac<0,锟絫锟紸锟絚直锟斤拷锟斤拷0锟斤拷锟絚锟斤拷锟斤拷锟紸锟絚直锟斤拷锟斤拷锟絰

锟斤拷锟斤拷(2)锟斤拷锟紹=0锟斤拷直锟斤拷锟斤拷Ax+C=0,锟斤拷x=-C/A.锟斤拷平锟斤拷锟斤拷y锟絊(锟斤拷直锟斤拷x锟絊)

锟斤拷锟斤拷锟斤拷x^2+y^2+Dx+Ey+F=0锟斤拷锟斤拷(x-a)^2+(y-b)^2=r^2

锟斤拷锟斤拷锟斤拷y=b,锟斤拷锟斤拷藭r锟侥兩傦拷x值x1,x2,锟斤拷锟斤拷锟揭傦拷規(gu锟斤拷)锟斤拷x1

锟斤拷锟斤拷锟斤拷x=-C/Ax2锟絩锟斤拷直锟斤拷锟絚锟紸锟斤拷锟絰

锟斤拷锟斤拷锟斤拷x1

锟斤拷锟斤拷锟斤拷x=-C/A=x1锟斤拷x=-C/A=x2锟絩锟斤拷直锟斤拷锟絚锟紸锟斤拷锟斤拷

锟斤拷锟斤拷锟紸锟侥讹拷锟斤拷锟斤拷

锟斤拷锟斤拷1.锟斤拷锟斤拷同一直锟斤拷锟较碉拷锟斤拷锟絚锟絖锟斤拷一锟斤拷锟紸锟斤拷

锟斤拷锟斤拷2.锟斤拷锟斤拷锟斤拷锟斤拷 锟斤拷直锟斤拷锟揭碉拷直锟斤拷平锟斤拷锟紷锟絣锟揭诧拷锟斤拷平锟斤拷锟斤拷锟斤拷锟斤拷锟侥兩條锟斤拷

锟斤拷锟斤拷锟斤拷論1.锟斤拷平锟斤拷锟斤拷(锟斤拷锟斤拷直锟斤拷)锟斤拷直锟斤拷锟斤拷直锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷平锟斤拷锟斤拷锟斤拷锟斤拷锟侥兩條锟斤拷

锟斤拷锟�锟斤拷锟斤拷业拇锟街逼斤拷志锟斤拷锟�(j锟斤拷ng)锟絕锟紸锟侥ｏ拷锟斤拷锟斤拷平锟斤拷锟斤拷锟斤拷锟斤拷锟侥兩條锟斤拷

锟斤拷锟�锟斤拷锟狡斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟揭伙拷l锟斤拷锟斤拷直锟斤拷锟斤拷锟斤拷直平锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷平锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟絣锟斤拷

锟斤拷锟斤拷锟斤拷論2.锟紸锟侥兩條平锟斤拷锟斤拷锟斤拷锟紸锟侥伙拷锟斤拷锟�

锟斤拷锟斤拷3.锟紸锟斤拷锟皆圓锟侥為對锟絈锟斤拷锟侥碉拷锟斤拷锟侥岋拷锟絈锟紻锟斤拷

锟斤拷锟斤拷4.锟紸锟角讹拷锟絚锟侥撅拷锟絰锟斤拷锟节讹拷锟絃锟斤拷锟絚锟侥硷拷锟斤拷

锟斤拷锟斤拷5.锟紸锟侥冿拷(n锟斤拷i)锟斤拷锟斤拷锟皆匡拷锟斤拷锟角圓锟侥的撅拷锟絰小锟节半徑锟斤拷锟絚锟侥硷拷锟斤拷

锟斤拷锟斤拷6.锟紸锟斤拷锟解部锟斤拷锟皆匡拷锟斤拷锟角圓锟侥的撅拷锟絰锟斤拷锟节半徑锟斤拷锟絚锟侥硷拷锟斤拷

锟斤拷锟斤拷7.同锟紸锟斤拷葓A锟侥半徑锟斤拷锟�

锟斤拷锟斤拷8.锟斤拷锟斤拷锟絚锟侥撅拷锟絰锟斤拷锟节讹拷锟絃锟斤拷锟絚锟斤拷軌锟紼锟斤拷锟斤拷锟皆讹拷锟絚锟斤拷A锟斤拷锟斤拷锟斤拷锟絃锟斤拷霃斤拷膱A

锟斤拷锟斤拷9.锟斤拷锟斤拷 锟斤拷同锟紸锟斤拷葓A锟叫ｏ拷锟斤拷鹊膱A锟侥斤拷锟斤拷锟斤拷锟侥伙拷锟斤拷锟�锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 锟斤拷龋锟斤拷锟斤拷锟斤拷锟斤拷业锟斤拷锟斤拷木锟斤拷锟斤拷

锟斤拷锟斤拷10.锟斤拷論 锟斤拷同锟紸锟斤拷葓A锟斤拷锟斤拷锟斤拷锟斤拷蓚锟斤拷A锟侥角★拷锟缴條锟斤拷锟斤拷锟缴條锟揭伙拷锟� 锟揭碉拷锟斤拷锟侥撅拷锟斤拷锟斤拷一锟組锟斤拷锟斤拷锟斤拷锟矫达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組锟斤拷锟斤拷锟斤拷锟�

锟斤拷锟斤拷11.锟斤拷锟斤拷 锟紸锟侥冿拷(n锟斤拷i)锟斤拷锟斤拷邊锟轿的岋拷锟角伙拷锟絘锟斤拷锟斤拷锟斤拷锟轿猴拷一锟斤拷锟斤拷嵌锟斤拷锟斤拷锟斤拷锟� 锟侥冿拷(n锟斤拷i)锟斤拷锟斤拷

锟斤拷锟斤拷12.锟斤拷直锟斤拷L锟酵★拷O锟洁交 d

锟斤拷锟斤拷锟斤拷直锟斤拷L锟酵★拷O锟斤拷锟斤拷 d=r

锟斤拷锟�锟斤拷锟街憋拷锟絃锟酵★拷O锟斤拷锟絰 d>r

锟斤拷锟斤拷13.锟叫撅拷锟斤拷锟叫讹拷锟斤拷锟斤拷 锟斤拷(j锟斤拷ng)锟絕锟诫徑锟斤拷锟斤拷瞬锟斤拷掖锟街憋拷锟斤拷@锟絣锟诫徑锟斤拷直锟斤拷锟角圓锟斤拷锟叫撅拷

锟斤拷锟斤拷14.锟叫撅拷锟斤拷锟斤拷锟絴(zh锟斤拷)锟斤拷锟斤拷 锟紸锟斤拷锟叫撅拷锟斤拷直锟节斤拷(j锟斤拷ng)锟絕锟斤拷锟絚锟侥半徑

锟斤拷锟斤拷15.锟斤拷論1 锟斤拷(j锟斤拷ng)锟絕锟紸锟斤拷锟揭达拷直锟斤拷锟叫撅拷锟斤拷直锟斤拷锟截斤拷(j锟斤拷ng)锟絕锟斤拷锟絚

锟斤拷锟斤拷16.锟斤拷論2 锟斤拷(j锟斤拷ng)锟絕锟斤拷锟絚锟揭达拷直锟斤拷锟叫撅拷锟斤拷直锟斤拷锟截斤拷(j锟斤拷ng)锟絕锟紸锟斤拷

锟斤拷锟斤拷17.锟叫撅拷锟絃锟斤拷锟斤拷 锟侥圓锟斤拷一锟絚锟斤拷锟紸锟侥兩條锟叫撅拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫撅拷锟絃锟斤拷锟�锟斤拷 锟紸锟侥猴拷锟紷一锟絚锟斤拷锟紹锟斤拷平锟街兩條锟叫撅拷锟侥夾锟斤拷

锟斤拷锟斤拷18.锟紸锟斤拷锟斤拷锟斤拷锟斤拷邊锟轿的兩組锟斤拷邊锟侥猴拷锟斤拷锟� 锟斤拷堑锟斤拷趦锟�(n锟斤拷i)锟斤拷锟斤拷

锟斤拷锟斤拷19.锟斤拷锟斤拷蓚锟斤拷A锟斤拷锟斤拷锟斤拷锟斤拷么锟斤拷锟絚一锟斤拷锟斤拷锟紹锟侥撅拷锟斤拷

锟斤拷锟斤拷20.锟劫兩圓锟斤拷锟絰 d>R+r 锟节兩圓锟斤拷锟斤拷 d=R+r

锟斤拷锟斤拷锟桔兩圓锟洁交 R-rr)

锟斤拷锟�锟斤拷軆蓤A锟斤拷(n锟斤拷i)锟斤拷 d=R-r(R>r) 锟捷兩圓锟斤拷(n锟斤拷i)锟斤拷dr)

锟斤拷锟斤拷21.锟斤拷锟斤拷 锟洁交锟缴圓锟斤拷锟紹锟侥撅拷锟斤拷直平锟街兩圓锟侥癸拷锟斤拷锟斤拷

锟斤拷锟斤拷22.锟斤拷锟斤拷 锟窖圓锟街筹拷n(n≥3)锟斤拷

锟斤拷锟斤拷(1)锟斤拷锟斤拷锟紹锟結(ji锟斤拷)锟斤拷锟斤拷锟絚锟斤拷锟矫的讹拷邊锟斤拷锟斤拷锟紷锟斤拷锟紸锟侥冿拷(n锟斤拷i)锟斤拷锟斤拷n邊锟斤拷

锟斤拷锟斤拷(2)锟斤拷(j锟斤拷ng)锟絕锟斤拷锟斤拷锟絚锟斤拷锟紸锟斤拷锟叫撅拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫撅拷锟侥斤拷锟絚锟斤拷锟斤拷c锟侥讹拷邊锟斤拷锟斤拷锟紷锟斤拷锟紸锟斤拷锟斤拷锟斤拷锟斤拷n邊锟斤拷

锟斤拷锟斤拷23.锟斤拷锟斤拷 锟轿猴拷锟斤拷锟斤拷邊锟轿讹拷锟斤拷一锟斤拷锟斤拷訄A锟斤拷一锟斤拷锟斤拷(n锟斤拷i)锟叫圓锟斤拷锟紷锟缴傦拷锟紸锟斤拷同锟侥圓

锟斤拷锟斤拷24.锟斤拷n邊锟轿碉拷每锟斤拷锟斤拷(n锟斤拷i)锟角讹拷锟斤拷锟斤拷(n-2)×180°/n

锟斤拷锟斤拷25.锟斤拷锟斤拷 锟斤拷n邊锟轿的半徑锟斤拷邊锟侥撅拷锟斤拷锟絥邊锟轿分筹拷2n锟斤拷全锟饺碉拷直锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷26.锟斤拷n邊锟轿碉拷锟斤拷eSn=pnrn/2 p锟斤拷示锟斤拷n邊锟轿碉拷锟斤拷锟絃

锟斤拷锟斤拷27.锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷e√3a/4 a锟斤拷示邊锟絃

锟斤拷锟斤拷28.锟斤拷锟斤拷锟揭伙拷锟斤拷锟絚锟杰囷拷锟斤拷k锟斤拷锟斤拷n邊锟轿的斤拷锟斤拷锟斤拷锟斤拷锟紷些锟角的和戯拷锟斤拷 360°锟斤拷锟斤拷锟絢×(n-2)180°/n=360°锟斤拷锟斤拷(n-2)(k-2)=4

锟斤拷锟斤拷29.锟斤拷锟絃計锟姐公式锟斤拷L=n兀R/180

锟斤拷锟斤拷30.锟斤拷锟斤拷锟斤拷e锟斤拷式锟斤拷S锟斤拷锟斤拷=n兀R^2/360=LR/2

锟斤拷锟斤拷31.锟斤拷(n锟斤拷i)锟斤拷锟叫撅拷锟絃= d-(R-r) 锟解公锟叫撅拷锟絃= d-(R+r)

锟斤拷锟斤拷32.锟斤拷锟斤拷 一锟絣锟斤拷锟斤拷锟斤拷锟侥圓锟杰角碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥圓锟侥角碉拷一锟斤拷

锟斤拷锟斤拷33.锟斤拷論1 同锟斤拷锟斤拷然锟斤拷锟斤拷锟斤拷膱A锟杰斤拷锟斤拷锟�;同锟紸锟斤拷葓A锟斤拷锟斤拷锟斤拷鹊膱A锟杰斤拷锟斤拷锟斤拷锟侥伙拷也锟斤拷锟�

锟斤拷锟斤拷34.锟斤拷論2 锟斤拷A(锟斤拷直锟斤拷)锟斤拷锟斤拷锟侥圓锟杰斤拷锟斤拷直锟斤拷;90°锟侥圓锟杰斤拷锟斤拷 锟斤拷锟斤拷锟斤拷锟斤拷直锟斤拷

锟斤拷锟斤拷35.锟斤拷锟絃锟斤拷式 l=a*r a锟角圓锟侥角的伙拷锟饺旓拷(sh锟斤拷)r >0 锟斤拷锟斤拷锟斤拷e锟斤拷式 s=1/2*l*r

锟斤拷锟斤拷锟斤拷锟絇锟斤拷锟絔锟斤拷

锟斤拷锟斤拷锟竭匡拷锟斤拷(sh锟斤拷)锟絎知锟絉锟絚锟絉锟斤拷

锟斤拷锟斤拷锟竭匡拷锟斤拷(sh锟斤拷)锟絎平锟斤拷锟斤拷锟斤拷知锟絉锟絚

锟斤拷锟铰高匡拷锟結訊锟斤拷锟竭匡拷锟斤拷锟斤拷锟斤拷锟斤拷前锟绞傦拷锟斤拷志愿锟斤拷锟斤拷取锟街旓拷(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