Answer:
618.4 unit^2.
Explanation:
We have 6 surfaces ( 3 pairs of equal area) so it is:
2 * 8.6*10 + 2 * 8.6*12 + 2 * 10*12
= 2 * 86 + 24*8.6 + 2 * 120
= 618.4.
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