cho tam giac abc vuong tai A co goc B= 30 do . CMRAC=1/2BC
cho tam giac abc vuong tai A co goc B= 30 do . CMRAC=1/2BC
Xét ΔABC vuông tại A có sin B=AC/BC
=>AC/BC=sin 30=1/2
=>AC=1/2BC
cho tam giac aBC vuong tai A co goc B=30 do, AB=6cm,Tia phan giac goc C cat AB tai D.Tinh AB va BD
tam giac ABC vuong tai A co BC = 10cm; goc B= 30 do; lay D thuoc canh BC sao cho goc BAD =15 do. Khi do CD =
Tam giac ABC vuong tai A co goc B = 30 do , AB = 3cm . Tinh cac do dai AC, BC
Cho tam giac ABC vuong tai A co goc C bang 30 do chung minh BC =2AB
cho tam giac ABC vuong tai A co goc C bang 30 do chung minh BC = 2AB
Cho tam giac ABC vuong tai A co goc C bang 30 do chung minh BC =2AB
Bai 1: Cho tam giac ABC vuong can tai A. Ve phia ngoai tam giac ABC, ve tam giac BCD vuong can tai B. Tu giac ABCD la hinh gi ? Vi sao?
Bai 2: Hinh thang vuong ABCD co goc A= goc D=90 do, AB=AD=2cm, DC= 4cm. Tinh cac goc cua hinh thang
Giup minh vs! Excuse me! Thank you rat nhieu !^^
cho tam giac abc vuong tai a co goc b bang 60 do tren canh bc lay diem h sao cho hb=ab duong vuong goc voi bc tai h cat ac tai d
a/ cm bd la tia phan giac cua goc adc
b/ chung to tam giac bdc can