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xenn [34]
3 years ago
11

Total surface area. pls explain ​

Mathematics
2 answers:
Lisa [10]3 years ago
8 0

Answer:just add everything

Step-by-step explanation:

Maslowich3 years ago
5 0

9514 1404 393

Answer:

  144 m²

Step-by-step explanation:

The total surface area is the sum of the areas of the four triangular faces.

Three of them have a base of 10 and a height of 6.7. The fourth has a base of 10 and a height of 8.7. Here, we'll show the sum in one expression, so we can do some simplification.

  A = ∑(1/2)bh = (1/2)(10)(6.7) +(1/2)(10)(6.7) +(1/2)(10)(6.7) +(1/2)(10)(8.7)

  = (1/2)(10)(3·6.7 +8.7) = 5(28.8) = 144 . . . . square meters

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