Cho hinh thang ABCD, AB = 6cm, CD = 9cm. AD cat BC tai I. IA = 4cm, IB
= 5cm. Tinh do dai doan AD; BC ?
NB
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Cho hinh thang vuong ABCD co canh ben AD vuong goc voi 2 day.Day be AB ,day lon CD canh ben AD co do dai lan luot la 12,5 dm; 37,5 dm va 22 dm .Keo dai hai canh ben AD va BC cu hinh thang thi chung cat nhau tai K .Tinh dien tich hinh thang ABCD .Tim ti so hai doan thang KA va KD
cho hinh thang ABCD ( AB//CD) goi E,F,I,K lan luot la trung diem AD,BC,CA,BD tinh do dai doan thang EK,KI,IF biet AB=12cm,CD=16cm ; AB=8cm , CD=6cm
cac bn giup mik nhe
Cho hinh thang vuong ABCD ,goc A=goc D=90 do, AB<CD,duong thang qua A song song vs BC cat CD tai E
A) Chung minh rang Sabce=AD×AB
B)Tinh dien tich hinh thang ABCD,biet AB=4cm,BC=10cm,CD=12 cm
VE HINH GIUM MIK NHE!!!!!!
bai 1 cho hinh thang can abcd va abcd ke ac duong cao ah va bk ua hinh thang goi m la trung diem ad va n la trung diem bc m va n lan luot cat bd tai e va ac tai d biet ab 4cm cd 10 cm tinh efbai2 cho tam giac abc can tai a co abbc 2 dg trung tuyen ad va be duong thang qua e // bc cat ab tai f goi i va k lan luot la trung diem bf va ce biey ik 7,5 ad 12 tinh bcc va tinh chi vi hinh thangbai 3cho tu giac abcd co goc a goc d , goc b + goc c 180 goi m , n theo thu tu la trung diem bc va ad a)...
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bai 1 cho hinh thang can abcd va ab<cd ke ac duong cao ah va bk ua hinh thang goi m la trung diem ad va n la trung diem bc m va n lan luot cat bd tai e va ac tai d biet ab =4cm cd = 10 cm tinh ef
bai2 cho tam giac abc can tai a co ab>bc 2 dg trung tuyen ad va be duong thang qua e // bc cat ab tai f goi i va k lan luot la trung diem bf va ce biey ik = 7,5 ad= 12 tinh bcc va tinh chi vi hinh thang
bai 3cho tu giac abcd co goc a = goc d , goc b + goc c = 180 goi m , n theo thu tu la trung diem bc va ad a) cm abd la hinh vuong b) cm am = dm c) cho ab = 3cm ad= 4m bc= 5cm tinh mn
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Cho hinh thang ABCD co 2 day AB va CD . Goi M la trung diem cua AD , N la trung diem cua BC . Biet AB=6cm ; MN=10cm . tinh do dai doan DC
Cho hinh thang ABCD co 2 day AB va CD . Goi M la trung diem cua AD , N la trung diem cua BC . Biet AB=6cm ; MN=10cm . tinh do dai doan DC
cho hinh thang abcd co S= 15 dm vuong. keo dai ab 1doan be=ab; keo dai ab 1 doan cg=bc; keo dai cd 1 doan dh=cd va keo dai ad 1 doan ak=ad. tinh S hinh tu giac eghk
cho hinh thang abcd co dien tich la 30m2 keo dai ab mot doan be =ab keo dai bc mot doan cg = bc keo dai cd mot ak = ad tinh dt tu giac eghkdoan dh=cd va keo ad mot doan
Hinh thang ABCD co day AB=9cm va day CD=12cm.Neu keo dai day be them mot doan BE=4cm va keo day lon them CG=5cm thi S hinh thang tang 13.5cm2.Tinh SABCD