This looks like a right angle triangle. Therefore, you can apply the Pythagoras theorem. It states that in a right angle triangle, the square of the hypotenuse is equal to the sum of squares of the lengths of other two sides. Hence, in this case, since L is the hypotenuse:
L ^ 2 = (9 ^ 2) + (16 ^ 2)
L ^ 2 = 81 + 256
L ^ 2 = 337
L = 18.3576 inches.
Now 1 inch = 0.0254 meters
Therefore, L = 0.4663 m
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