CRYSTAL pyramids have been found beneath the Bermuda Triangle and could be responsible for ships and planes disappearing, it has been claimed. Giant pyramids “three times the size of the Great Pyramid ...
The area of the base is \(5 \times 5 = 25~\text{cm}^2\). The area of each triangular face is \((5 \times 6) \div 2 = 15~\text{cm}^2\). There are four identical triangular faces, so the total surface ...
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