Jawabanmu

2014-05-18T20:54:58+07:00
AB = (5x-2) cm ; AD = (3x+2) cm ; kll = 64 cm
a. kll = 2AB + 2AD
    64 = 2(5x-2) + 2(3x+2)
    64 = 10x - 4 + 6x + 4
    64 = 16x
    x = 64/16
    x = 4
b. AB = 5x-2 = 5(4)-2 = 18 cm
    CD = AB = 18 cm
c. AD = 3x+2 = 3(4)+2 = 14 cm
    BC = AD = 14 cm
1 1 1
2014-05-18T20:57:50+07:00
64/2 =32
X= (5x - 2) + (3x + 2) = 32
                  8x          = 32
                             x = 32/8
                             x = 4
b. AB= 5(4) - 2 = 18 AB=CD = 18
c.AD= 3(4) +2 = 14 AD=BC 14