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kita mencari TF (rusuk tegak) dulu
TF = akar TE kuadrat + EF Kuadrat = akar 12kuadrat + 5 kuadrat = akar 169 = 13 cm
Luas Per = LA + jumlah luas sisi tegak
LP= (ab . bc) + 4 (1/2 . bc . tf )
= (10 . 10) + 4 (1/2 . 10. 13 )
= 100 + 260
= 360 cm kuadrat
semoga bermanfaat guys. kalo kurang jelas boleh tanya