Volume = Length × Width × Height
276 = Length × 5.8 × 10
276 = Length × 58
Solve for length

Philip P.
tutor
You're right. The formula for a triangular prism is:
V = (1/2) × base length of triangle × base height of triangle × length of prism
V = (1/2) × base of triangle × 5.8 × 10
276 = 29 × base of triangle
Solve for base
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05/02/18
Derpy P.
Now I know where you live...
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05/06/18
Derpy P.
05/02/18