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√8²+6²
= √64 + 36
= √100
= 10 cm
Panjang rusuk limas pada sisi tegaknya:
= √5²+12²
= √25 + 144
= √169
= 13 cm
Jumlah rusuk alas:
= 2 (6) + 2 (8) + 4 (13)
= 12 + 16 + 52
= 80 cm