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Leno4ka [110]
3 years ago
13

1. The surface area of a cylinder is T=2rtrh+2tr2, where T is the surface area, andr

Mathematics
2 answers:
stellarik [79]3 years ago
6 0

Answer:

the surface  area of a penny = 662.81 mm²

Step-by-step explanation:

got this correct in exam

kap26 [50]3 years ago
4 0

Answer:

the surface  area of a penny = 662.81 mm²

Step-by-step explanation:

given:

A penny is a cylinder with a diameter of 19.05 millimeters

and a thickness of 1.55 millimeters.

find:

what is the surface  area of a penny?

<u>surface area of a cylinder formula: </u>

As = 2 π r h + 2 π r²

let r = 19.05 / 2

r = 9.53 mm

let h = 1.55mm

plugin values into the formula:

As = 2 π (9.53) 1.55    +    2 π (9.53)²

As = 92.76 +  570.05

As = 662.81 mm²

therefore,

the surface  area of a penny = 662.81 mm²

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