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a. LP = 2(pl+pt+lt)
= 2(10.8+10.5+8.5)
=2(80+50+40)
= 2(170 = 340
2. p=l=8 , t = 10
Lp= 2(8.8 + 8.10+8.10)
=2(64+80+80)
= 448cm²
3. a .
luas persegi= 64
s² = 64
s = 8 (p =l = 8cm)
t = 1 +p= 9cm
b.Lp = 2(64+72+72) = 416cm²