length of the base to the nearest meter?

Question

The pyramid in peru has square base. The length of the diagonal of the base is 154m. How do I get the side length of the base to the nearest meter?

Answer 1

Diagonal forms two right triangles in base; they're isosceles rt triangles (45-45-90 type) so the side length is the diagonal length divided by the square root of two. This is based on x²+x²=d².