24 sides
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A hexagon has six sides, and an octagon has eight. 3 hexagons and 3 octagons have 3*6 + 3*8 sides = 18 + 24 sides = 42 sides altogether.
64.
There are: (5*12)+(3*8) = 84 sides
No. All 2-dimensional shpaes with 8 sides are octagons; all 3-dimensional shapes with 8 sides are called octahedrons.
No