Answer to Question #282372 in Geometry for lol

Question #282372

While standing in line for the water fountain, Billy sees his lab partner 3 feet ahead of him and his best friend 9 feet to his right. Billy wants to go ask his lab partner a question, then go chat with his friend, and finally return to the water fountain line. How far will Billy have to walk in all? If necessary, round to the nearest tenth.


1
Expert's answer
2021-12-26T17:18:04-0500

Solution:


Let B be the position of Billy, L be his lab partner's and F be his friend's.

This forms a right-angled triangle.

Apply pythagoras theorem in it.

BL2+BF2=LF232+92=LF29+81=LF2LF2=90LF=909.5 ftBL^2+BF^2=LF^2 \\ \Rightarrow 3^2+9^2=LF^2 \\\Rightarrow 9+81=LF^2 \\ \Rightarrow LF^2=90 \\ \Rightarrow LF=\sqrt{90}\approx9.5\ ft

Total distance billy has to cover =BL+BF+LF=3+9+9.5=21.5 ft=BL+BF+LF=3+9+9.5=21.5\ ft


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