a: CB=4-1=3(cm)
b: CD=CB+BD=2+3=5(cm)
a: CB=4-1=3(cm)
b: CD=CB+BD=2+3=5(cm)
cho doan thang AB = 5cm va diem C nam giua 2 diem A va B sao cho CB = 3cm
a, tinh do dai doan thang AC
b, tren tia doi cua tia CA lay diem D sao cho CD = 5cm hay so sanh AC va BD
Bai 2 : Tren tia Ox lay 2 diem N va P sao cho ON=6cm . Tren tia doi cua tia Ox lay diem M sao cho OM= 2cm a) Tinh do dai doan thang NP? b) Co nhan xet gi va diem N doi voi doan thang NP?
bai 1: tren tia Ox lay 2 diem A,B sao cho OA = 4 cm , OB = 7 cm
a) tinh AC
b) goi C la trung diem cua OA . tinh AC
c) tren tia doi cua tia Ox ,lay diem D sao cho OD=2cm. hoi O co la trung diem cua CD khong ? vi sao?
Cac ban nho ve hinh nha!
ve doan thang MN dai 8 cm. goi R la trung diem cua MN.
a) tinh MR;RN
b) lay 2 diem P va Q tren doan thang MN sao cho NP=NQ=3cm. tinh RP ; RQ
c) diem R co la trugn diem cua doan thang PQ ko?
Cho tam giac ABC co BC=5cm . Diem D thuoc canh BC sao cho DC=2cm . Cho biet goc ADB=70o
a)Tinh do dai BD?
b)Tren nua mat phang chua A co bo BC , ve tia Dx sao cho goc CDx =50o.Tinh goc ADx?
c)Goi M la giao diem cua tia Dx va canh AC ,tim cac tam giac trong hinh ve
Bai 1: Cho doan thang AB=8cm . Tren tia AB lay diem M sao cho AM=4cm a) Diem Mco nam giua hai diem A va B khong ? Vi sao? b) So sanh AM va MB c) M co la trung diem cua doan thang AB khong?
Cac giai ho minh . Nho ve hinh nha !
Thank you very much
cho tam giac ABC co goc A vuong canh AB = 40m canh AC = 30m canh BC = 50m tren canh AC lay diem F tren canh AB lay diem E sao cho hinh thang EFCB co chieu cao la 12m tinh dien tich cua tam giac AEF va dien tich hinh thang EFCB ?
cho tam giac abc vuong tai a do dai ab = 30cm , ac=40cm tren ab lay diem e sao cho e = 1/3 ab . D la trung diem cua dc noi a voi d ,c voi e cat nhau tai m . tinh dien tich ema
bai :2 tren tia Ox ve hai diem A,B sao cho OA = 5cm , OB = 3cm
a) ve hinh da cho
b) trong 3 diem O, A , B diem nao nam giua hai diem con lai ?vi sao
c) tinh AC
d) cho diem D tren tia Ox , sao cho B la trung diem cua OD . tinh AD