Jawabanmu

2014-09-10T07:57:03+07:00
AB = 12 cm
AD = 8 cm
CE = 10 cm

BC= \sqrt{AD^2 - CE^2 }  \\ = \sqrt{10^2 - 8^2}  \\ = \sqrt{100-64}  \\ = \sqrt{36} \\ =6 cm

DE  ??=  \sqrt{AD^2 + CE^2}  \\ = \sqrt{8^2 + 10^2} = 64+100 = 1644