What is the surface area of a cylindrical cylindrical ring, or toru, ifits out side diameter is 16mm and its inside diameter is 10mm?round off your answer to the nearnest whle number wich one is correct is it A 92mm or B 118mm or C 123mm or D 385 mm wich one is correct

Matias Aguirre 2022-07-26 Answered
What is the surface area of a cylindrical cylindrical ring, or toru, ifits out side diameter is 16mm and its inside diameter is 10mm?round off your answer to the nearnest whle number wich one is correct is it A 92mm or B 118mm or C 123mm or D 385 mm wich one is correct
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Answers (1)

yatangije62
Answered 2022-07-27 Author has 16 answers
The area of a circle is A = π r 2 . The diameter is d = 2r. Therefore the radius of the outside is 8mm and the radius of theinside is 5mm. Since the inside circle is blank, you need tosubtract that blank area from the larger area to get the area ofthe ring.
π ( 8 2 ) π ( 5 2 ) = π ( 64 m m 25 m m ) = 122.52 m m   o r   123 m m

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