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In a square of a side length s, what is the length of a diagonal?

1 Answer

5 votes
s - length of a square

d - length of a diagonal

d = s√2

why?

Use the Pythagorean theorem:

d² = s² + s²
d² = 2s²
d = √(2s²)
d = √2 · √s²
d = s√2
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