Jawabanmu

2014-05-27T20:25:00+07:00
Panjang = 5x-3
Lebar = 3x-1
Keliling = 20 m

dit = x, Panjang & Lebar
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Jawab
Kel = p+p+l+l
20 m = 5x - 3 + 5x - 3 + 3x - 1 + 3x - 1
20 m = 16x -8
20 m + 8 = 16x
28 m = 16x 
x = 1, 75 m
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Panjang = 5x - 3
Panjang = 5. 1,75 - 3
Panjang = 8,75 - 3
Panjang = 5,75 m
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Lebar =  3x - 1
Lebar = 3. 1,75 - 1
Lebar = 5,25 - 1
Lebar = 4,25 m

Pembuktian 
Kel = 5,75 + 5,75 + 4,25 + 4,25
kel = 11,50 + 8,50
Kel = 20 m
2 3 2