Question

If (a+b+c) (a-b+c) =
${a}^{2} + {b}^{2} + {c}^{2}$
then show that a,b,c is in continued proportion.


​

Answer 1

Step-by-step explanation:

Roads are easy to build and maintain as compare to railways.

Constructions cost of roads is much lower that of railway lines.

Roads as compare to railways lines can negotiate higher gradients of slopes easily and as such can traverse mountains like Himalayas.