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LS= 1/2 a x t
1/2x 10 x 12
60cm x 2= 120 cm
LP= s x s
20 x 20
400 cm
hasil akhir
LS + LP= 120 + 400
520 cm
2)Keliling
KS= 20 + 10 + 12
42 x 2= 84 cm
KP= 20 x 4
80 cm
hasil akhir
KS + KP = 164