Two edges of a rectangular box going out from one vertex are equal to 2 and 8. The surface area of this box is equal
| September 12, 2021 | education
Two edges of a rectangular box going out from one vertex are equal to 2 and 8. The surface area of this box is equal to 212. Find the third edge going out from the same vertex.
S = 212, a = 2, b = 8.
c = (212 – 2 x 2 x 8) / (2 x 2 + 2 x 8).
C = 180/20 = 9.
Answer: edge length c = 9.
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