Answer:
200.2
Explanation:
I would hate to own such a shed. It's not very big.
2 meters = 2 * 100 cm = 200 cm
The diagonal of the floor is the diagonal of 6cm by 5cm. Using a^2 + b^2 = c^2
5^2 + 6^2 = 25 + 36 = 61
The square root of 61 is 7.81 cm
Now the diagonal of the floor diagonal and the height
a^2 + h^2 = board^2
61 + 200^2 = board^2
61 + 40000 = board^2
40061 = board^2
sqrt(board^2) = sqrt(40061)
board = 200.2cm long.
Maybe you should check the question for units.