The total height in feet of the piece of plywood is 14 foot.
The theorem states that the square of the hypotenuse of a right triangle is equal to the sum of the square of the other two sides.
The Pythagoras theorem: a² + b² = c²
where a = length
b = base
c = hypotenuse
13² = 5² + h²
169 = 25 + h²
h² = 169 - 25
h² = 144
h = √144
h = 12 foot
12 + 2 = 14 foot
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