Answer:
Galileo should walk up to 480.79 meter over the inclined plane.
Explanation:
To know the distance which Galileo walks we will treat the inclinate plane as the hypotenuse of a rigth triangle where the altitude will be the opposite side.
For the trigonometric equations we know:
sin α = oppossit side / hypotenuse
hypothenuse = opposite side / sin α
Replacing the values for the opposite side and the inclination α:
hypothenuse = 100 m / sin 12° = 100 m / 0.2079 = 480.973434 m
Rounding the result to nearest hundreath:
hypothenuse = 489.97 m