Answer to Question #278525 in Geometry for Lisa

Question #278525

While standing in line for the water fountain, Brian sees his lab partner 4 feet ahead of him and his best friend 7 feet to his right. Brian 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 Brian have to walk in all? If necessary, round to the nearest tenth.


1
Expert's answer
2021-12-22T06:53:06-0500

Look at the Fig.1



A – the point, where Brin is standing (the water fountain line)

B - the point, where his lab partner is standing (4 feet)

C - the point, where his friend is standing (7 feet)

ΔABC – right angled triangles

Brain’s way:

1.     to go ask his lab partner a question:

from point A to B = 4 (feet)

2.     to go chat with his friend:

from point B to C

Use Pythagorean theorem:

"\\boxed{a^2+b^2=c^2}" , where

a=AB=4; b=AC=7;

c=BC=?

c="\\sqrt{a^2+b^2}=\\sqrt{4^2+7^2}=\\sqrt{65}\\approx" 8.06 (feet)

3.     return to the water fountain line

from point C to A = 7 (feet)

4.    Sum all route segments:

4+8.06+7 "\\approx" 19.1 (feet)

Answer: 19.1 feet


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