Geometrymedium · Past Paper
Find the length of the diagonal of a square if its side is 5 cm (relate to isosceles right triangle).
A5 cm
B10 cm
C5 sqrt(2) cm
D25 cm
✓ Correct Answer: C — 5 sqrt(2) cm
A square diagonal forms an isosceles right triangle with sides 5, 5. Diagonal = sqrt(5^2 + 5^2) = 5 sqrt(2).
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