Math, asked by shekharmayank3pen4wm, 1 year ago

Please solve Volume Surface Area Questions 17,18,19,20

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Answered by ShuchiRecites
2
Hello Mate!

Please refer to attachment.

Concept used in mentioned solutions.

17. Why total surface area of cylinder is 2π(R+r)(h+R-r)?

TSA = 2πRh + 2πrh + 2π( R² - r² )

= 2πh( R + r ) + 2π( R + r )( R - r )

= 2π( R + r )( h + R - r )

18. Area of sheet which is rapped around cylinder will be equal to its curved surface area.

19. Volume of Outer - Inner cylinder = Volume if actual cylinder

= πR²h - πr²h

= πh( R² - r² )

= πh( R + r )( R - r )

20. Basic knowledge of fomulas.

Have great future ahead!
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