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Verified answer
Dik:K=42 cmp-l=9 cm,p=9+l cm
Dit:L
Jwb: K=2(p+l)
42=2(9+l+l)
42/2=9+2l
21=9+2l
21-9=2l
12=2l
l=6 cm
p=9+l
=9+6=15 cm
L=pl
=15(6)
=90 cm^2
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Verified answer
Mapel : MatematikaKelas : VII SMP
Bab : Bangun datar
Pembahasan :
P - l = 9
P = 9 + l
Keliling = 2(p + l)
42 = 2(9 + l + l)
21 = 2l + 9
2l = 12
Lebar = 6 cm
Panjang = 9 + 6 = 15 cm
Luas = pl
Luas = 15.6
Luas = 90 cm²