Jawabanmu

2014-06-02T18:53:34+07:00
Panjang rusuk nya 40÷4=10 cm
diagonal sisinya 10 akar 2 cm
2014-06-02T18:56:05+07:00
Kll = 4 . s
40 = 4 . s
s = 40 / 4
s = 10 cm
panjang rusuknya 10 cm

panjang diagonal sisinya =  \sqrt{10² + 10²}
 \sqrt{100 + 100}
 \sqrt{200}
 \sqrt{100 x 2}
= 10 \sqrt{2} cm

jadi panjang diagonal sisinya = 10 \sqrt{2} cm