Question

Until 2014, the mass of a kilogram was defined as exactly equal to the mass of a special
platinum-iridium cylinder kept in Sèvres, France. The cylinder's diameter and height are
both 39.2 millimeters.
What is the surface area of this cylinder?
A .960.04 mm
B.2304.96 mm
C.7241 25 mm
D.2015.66 mm

Answer 1

Step-by-step explanation:

We have,

Diameter of cylinder, d = 39.2 mm

Radius, r = 19.6 cm

Height of the cylinder, h = 39.2 mm

It is required to find the surface area of this cylinder. The formula of the surface area of cylinder is given by :

$S=2\pi rh+2\pi r^2\\\\S=2\pi r(h+r)$

Putting all values we get :

$S=2\times\dfrac{22}{7}\times19.6\cdot(39.2+19.6)\\\\S=7244.16\ mm^2$