A piece for a board game is shaped like a triangular prism . The piece is 18 millimeters long . The base of the piece is an equilateral triangle with 10 - millimeter sides and a height of 9 millimeters . Find the surface area of the game piece.

step-by-step explanation:

the answer is 31.27mph

step-by-step explanation:

step by step solution :

step   1   :

1.1     4 = 22

(4)3 = (22)3 = 26

equation at the end of step   1   :

  ((23) • 26)2

step   2   :

equation at the end of step   2   :

  (23 • 26)2

step   3   :

final result :

  218

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