Jawabanmu

2014-03-12T17:54:25+07:00
Sudut dalam segi 12 = 360/12 = 30°
Ls = ½ bc sin A → b dan c = jari”
Ls = ½.8.8. sin 30 = 32 x ½ = 16 cm²
L = 12 x Ls = 12 x 16 = 192 cm²
1 5 1
2014-03-12T18:06:24+07:00
L= 2R^2√2
  = 2 X 8^2√2
  = 128√2