Question

The diameter of a circular microorganism is 7 nanometres (nm). Find the
(i) circumference in metres,
(ii) area in square metres,
of the microorganism. Give your answer in standard form. (take pi = 3.142 and 1nm = 10^-9)

Answer 1

Step-by-step explanation:

circumference of a circle whose radius is r is given by 2πr

Here r=7 cm

Hence circumference of the circle =2π(7)=2⋅

7

22

⋅7=2⋅22=44 cm