Explanation:
this is a college level question ????????
are you kidding me ?
Pythagoras we all know already latest since middle school (if not already from upper elementary school).
and you need help with that ?
always (ALWAYS !) remember Pythagoras :
a² + b² = c²
a, b are the legs, c is the Hypotenuse (the side opposite of the 90° angle).
so, in our case :
c² = 2² + 1² = 4 + 1 = 5
c = sqrt(5) ft = 2.236067977... ft
"sqrt" standing for "square root".