Tren duong thang d lay theo thu tu cac diem A1, A2, A3... A2000 va 1 diem B nam ngoai duong thang d. Co bao nhieu tam giac ma 3 dinh la cac diem noi B voi A1, A2, A3... A2000 ( giup voi, sao hong ai giup tui vay, help)
cho 10 diem phan biet thuoc 1 duong thang d va 1 diem O nam ngoai duong thang ay
so tam co cac dinh la 3 trong 11 diem tren
Cho 2009 diem thuoc duong thang a va mot diem nam ngoai duong thang ay.Co bao nhieu tam giac co cac dinh la ba trong 2010 diem tren?
cho tam giac ABC co BC=4cm. tren tia doi cua tia BC lay diem D sao cho BD=2cm/ a, tinh do dai CD; b,goi M la chung diem cua CD.tinh do dai BM;c,biet goc DAC bang 112 do .Ãxtia phan giac cua goc BAC va goc BAD. tinh so do goc xAy;d, tren nua mat phang bo la duong thang AC co chua diem D neu ve them n tia goc A phan biet khong trung voi cac tia ÂC,Ã,AB,Ay,AD thi co tat ca bao nhieu goc dinh A va Ay thu tu la
cho diem O nam ngoai duong thang d. tren dung thang d lay ba diem A,B,C saocho AB=6cm;AC=2cm
a tinh BC
b gia su goc OAB=180 do;tinh goc OAC
c tren dung thang d lay them 2015 diem phan biet [khac A,B,C] hoi co bao nhieu goc co dinh O va canh di qua 2 diem thuoc dung thang d
cho 2012 diem trong do co dung 2011 diem thang hang.Co bao nhieu tam giac co cac dinh la 3 trong 2012 diem noi tren
bai 1;cho 4 diem A,B,C,D. trong do khong co 3 diem nao thang hang. hoi co bao nhieu tam giac ma co 3 dinh la 3 trong 4 diem tren.
bai 2; cung hoi nhu bai 1, voi 10 diem A1,A2,A3,............A10
GIUP TO VOI
cho 5 diem A,B,C,D,E. HOI CO BAO NHIEU HINH TAM GIAC CO DINH LA 3 TRONG 5 DIEM TREN
1. Lay 4 diem A, B, C, D trong do khong co 3 diem nao thang hang. Ke cac duong thang di qua cac cap diem. Co bao nhieu duong thang tat ca? do la nhung duong thang nao?
2. Lay 4diem M,N,P,Q trong do 3 diem M,N,P thang hang va diem Q nam ngoai duong thang do. ke caacacc duong thang di qua cac cap diem. co bao nhieu duong thang phan biet? viet ten cac duong thang do
mong cac ban giai ho minh!