SOLUTION: Are the Surface areas A, B, and C correct? Use the following triangular prisms. Picture: https://imgur.com/JW6zKS6

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Question 1106889: Are the Surface areas A, B, and C correct?
Use the following triangular prisms.

Picture: https://imgur.com/JW6zKS6
Identify the prisms in order from least to greatest surface areas.
B = 330.5
C = 144.31
A = 82.62

Answer by math_helper(2461) About Me  (Show Source):
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I get B, C, A also (greatest to least) but my numbers are 360, 132, and 80, respectively.
Here is my calculation for B:
S = 8*13 + 6*13 + h*13 + 2((1/2)6*8)
[ 3 rectangular faces + last term for triangular top and bottom ]
h = +sqrt%286%5E2+%2B+8%5E2%29+=+sqrt%28100%29+=+10+
so S = 104 + 78 + 130 + 48
S = 360 sq units.