truncated icosahedron
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The perimeter would be 64 - since 8 x 8 = 64 !
64 cm
Your grade would be 64% if you get 16 out of 25 answers correct.
The perimeter of an octagon is 64 only if it is a regular octagon and the length of one side is 8. An irregular octagon may or may not have a perimeter of 64 (whatever units of measure you choose to use) depending on what the lengths of the individual sides are.
The volume of a regular pyramid with a square base of 8cm and a slant height of 5 cm is: 64 cm3