∠ACB=90°,cosA=根号3/3,AB=8cm
AC = ABcosA=8*根号3/3
BC=根号(AB^2-AC^2)=根号{8^2-(8*根号3/3)^2 } = 8根号(2/3)
S△ABC=1/2*AC*BC=1/2*8*根号3/3*8根号(2/3)= 32根号3 /3
∠ACB=90°,cosA=根号3/3,AB=8cm
AC = ABcosA=8*根号3/3
BC=根号(AB^2-AC^2)=根号{8^2-(8*根号3/3)^2 } = 8根号(2/3)
S△ABC=1/2*AC*BC=1/2*8*根号3/3*8根号(2/3)= 32根号3 /3