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l=l
keliling = 2(p+l)
56=2(4+l+l)
56=2(4+2l)
56=8+4l
48=4l
l=12
jadi, p=4+12=16cm, l=12 cm
diagonal=akar(12^2+16^2)=akar(144+256)=akar400=20cm