Question

What is the length of the diagonal of a 10cm by 15cm rectangle?

Answer 1

a² + b² = c²

So: 10² + 15² = c²

c² = 100 + 225

c² = 325

c = ± √325

Since we can't have negatives,

c = √325

c ≈ 18.028

Answer 2

5√13

Explanation:

a^2 + b^2 = c^2

10^2 + 15^2 = c^2

100 + 225 = c^2

√325 = c

5√13 = c