Question

Until 2014, the mass of a kilogram was defined as exactly equal to the mass of a special

Answer 1

Answer:

7241.25 mm squared

Step-by-step explanation:

The surface area of a cylinder is denoted by: $A=2\pi r^2+2\pi rh$, where r is the radius and h is the height.

Here, we know that the diameter is 39.2 mm, and since diameter is twice the radius, then r = d/2 = 39.2/2 = 19.6 mm. We also know that the height is 39.2 mm, so plug these values in:

$A=2\pi r^2+2\pi rh$

$A=2\pi (19.6)^2+2\pi *19.6*39.2=7241.25$ mm squared

The answer is about 7241.25 mm squared.

Answer 2

Answer:

surface area: 7241.25

Step-by-step explanation:

using this formula for surface area of cyclinder: 2πrh+2π$r^2$

diameter = 2r --> 39.2 = 2r

so r= 19.6