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28=2p+2l
14= p+l --> p=14-l
Diagonal= √(p^2)+(l^2)
10 = √(p^2)+(l^2)
100 = (p^2)+(l^2)
100 = (14-l)^2 + l^2
100 = 196-28l+l^2+l^2
100 = 196-28l+2l^2
2l^2-28l+96=0
l^2-14l+48=0
(l-6)(l-8)=0
l=6 atau l=8
Utk l=6 maka p=14-6=8
Utk l=8 maka p=14-8=6
Secara umum ukuran PP= p=8 dan l=6