Jawabanmu

2013-12-18T22:15:47+07:00
S = 1/2 keliling
   = 1/2 (21 + 10 + 17)
   = 1/2 (48)
   = 24

A =  \sqrt{s(s-a)(s-b)(s-c)}
   = [tex] \sqrt{24(24-21)(24-10)(24-17)} [/tex]
   = [tex] \sqrt{24(3)(14)(7)} [/tex]
   =  \sqrt{7056}
   = 84 cm^2
xie xie... yakin sama jwabannya kak?
yakin
xie xie...