Answer:
5 ft
Step-by-step explanation:
The triangular face is a right triangle with hypotenuse 13 ft
Use Pythagoras' identity in the right triangle
The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is
y² + 12² = 13²
y² + 144 = 169 ( subtract 144 from both sides )
y² = 25 ( take the square root of both sides )
y = [tex]\sqrt{25}[/tex] = 5
The height of the ramp is 5 ft
