Question

give reason why string is used to measure a river​

Answer 1

Explanation:

Since the scale is a straight and it is very hard to bend it for getting the correct measurement of the curve line. Thus we need much more flexible measuring thing to measure the curve line. So, a non-stretchable string or a thread is used to measure the length of curved line.

Answer 2

Answer:

because river can move in different directions

so scale cannot measure it

so string is used to measure a river

lol easy

hope it helps