Jawabanmu

2014-06-01T12:29:53+07:00
Luas jajargenjang = a × t
192 cm² = 3y × 4y
192 cm² = 12y²
-12y² = -192 cm²
y² = -192/-12
y² = 16 
y = √16
y = 4 cm

Tinggi = 3y
Tinggi = 3 × 4
Tinggi = 12 cm

alas = 4 × 4
= 16 cm
2014-06-01T12:53:55+07:00
L jajar genjang = alas . tinggi
192 = 4y . 3y
192 =  12y^{2}
192 : 12 =  y^{2}
16 =  y^{2}
4 = y
alas = 4y = 4 . 4 = 16
tinggi = 3y = 3 . 4 = 12