If the percentage error in the radius of a circle is 3%, then the percentage error in its area is:

A piece of cloth measured with a metre stick that is 1 cm short is found to be 50 metres long. What will be the actual length of the cloth (in cm) when measured with a correct metre stick?

A physical quantity D is related to four variable quantities p, q, r, and s as follows: D = p3q2r√s The percentage errors of measurement in p, q, r, and s are 1%, 3%, 2%, and 4%, respectively. What is the maximum percentage error in quantity D?