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panjang
p1:p2
20:30
2:3
lebar
l1:l2
10:15
2:3
b)keliling (2p+2l)
persegi panjang 1
20.2+10.2
40+20
=60
persegi panjang 2
30.2+15.2
60+30
=90
perbandingannya
60:90
2:3
c)luas (p.l)
persegi panjang 1
20.10
=200
persegi panjang 2
30.15
=450
perbandingannya
200:450
=4:9