Answer:
41
Explanation:
Imagine a right triangle with legs length 9 and 40, and hypotenuse is the diagonal length c.
a^2+b^2=c^2
9^2+40^2=c^2
81+1600=c^2
1681=c^2
sqrt both sides
41=c
The length of the diagonal is 41 units
Applying the Pythagorean theorem, the diagonal is calculated by:
D = sqrt(40^2 + 9^2) = 41
Hope this helps!
:)
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