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lebarnya (x+5) cm
kelilling = 62 cm
hitung luasnya
K = 2(p+l)
62 = 2((3x -2)+(x+5)
31 = 3x - 2 + x + 5
28 = 4x
x = 28/4 = 7
p = 3x-2 = 3x7-2=19 cm
l = x + 5 = 7 + 5 = 12 cm
luas = p x l
= 19 x 12
= 228 cm
jadi luas persegi panjang tersebut adalah 228
.
Lebar = ( x + 5 ) cm
Keliling = 62 cm
Jawab :
2( 3x - 2 + x + 5 ) = 62
2( 4x + 3 ) = 62
8x + 6 = 62
8x = 62 - 6
8x = 56
x = 7
Panjang = ( 3( 7 ) - 2 ) = 19 cm
Lebar = ( ( 7 ) + 5 ) = 12 cm
Maka, Luas nya 19 × 12 = 228 cm²