Question

Va rog am nevoie urgent dau coroana și 50 de puncte ​

Answer 1

a. BC=rad(12^2+5^2)=rad(144+25)=13

sin B=12/13

cos B=5/13

sin C=5/13

cos C=12/13

tgB=sinB:cosB=12/5

ctgB=5/12

tgC=5/12

ctgC=12/5

b. AC=rad(30^2-18^2)=rad(900-324)=24

sin B=24/30=4/5

cos B=18/30=3/5

sin C=3/5

cos C=4/5

tg B=4/3

ctg B=3/4

tg C=3/4

ctg C=4/3

c. AC=rad( 35^2-28^2)=rad(1225-784)=rad(441)=21

sin B=cos C=21/35=3/5

sin C=cos B=28/35=4/5

tg B=ctg C=3/4

tg C=ctg B=4/3