Question

What is the length in centimetres of a glass rod 7.82 inches long?

Answer 1

Answer:

It's length is 19.55 cm.

Answer 2

Answer:

19.9 cm

Explanation:

we know that 1 inch= 2.54 cm

therefore to convert 7.82 into cm we need to multiply it with 2.84 ....

i.e.,  7.82*2.54

= 19.8628

=19.9 cm (since the question has only 3 significant figures)