S(ABC)=1/2*AB*BC*sinB
S(ABC)=20sqrt{3}
AB=8 cm
BC=10 cm
1/2*8*10*sinB=20sqrt{3}
sinB=20sqrt{3}/40
sinB=sqrt{3}/2
B=60*
S(ABC)=1/2*AB*BC*sinB
S(ABC)=20sqrt{3}
AB=8 cm
BC=10 cm
1/2*8*10*sinB=20sqrt{3}
sinB=20sqrt{3}/40
sinB=sqrt{3}/2
B=60*