Until 2014, the mass of a kilogram was defined as exactly equal to the mass of a special platinum-iridium cylinder kept in Sèvres, Fra

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

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Clara 3 weeks 2021-11-14T01:08:07+00:00 1 Answer 0 views 0

Answers ( )

    0
    2021-11-14T01:09:50+00:00

    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

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45:7+7-4:2-5:5*4+35:2 =? ( )