Answer:
The correct option is B.
Step-by-step explanation:
It is given that top of the ramp is 4 feet above the ground and the bottom of the ramp is 18 feet from the building.
Draw a figure by using the given information.
From the figure it is clear than it is a right angled triangle with base 18 feet and height 4 feet.
According to the Pythagoras theorem,
\(hypotenuse^2=perpendicular^2+base^2\)
Using the Pythagoras theorem, the length of ramp is
\(AC^2=AB^2+BC^2\)
\(AC^2=4^2+(18)^2\)
\(AC^2=16+324\)
\(AC^2=340\)
Taking square root both the sides.
\(AC=\sqrt{340}\)
\(AC=18.439\)
\(AC\approx 18.4\)
The length of the ramp is 18.4 ft. Therefore the correct option is B.
