Jawabanmu

2014-05-09T20:29:05+07:00
Luas = 1/2 . 12. 18 = 108 cm2
keliling = 10,8 .4 = 43,267 cm
2014-05-10T05:24:15+07:00
Luas = 1/2 x d1 x d2
= 1/2 x 12 x 18
= 1/2 x 216
= 108

Keliling = 4s
karna sisi miring belum diketahui, maka cari menggunakan pythagoras
s miring = √6² + 9²
= √36 + 81
= 10,81
keliling = 4 x s
= 4 x 10,81
= 43,24