# it is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. how many square metres of the sheet are required for the same?

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## It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square metres of the sheet are required for the same.

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## It is required to make a closed cylindrical tank of height 1m and base diameter 140cm from a metal sheet. How many square metres of the sheet are required for the same.

Total Surface Area of cylinder is 2πrh+2πrEasy Open in App Solution Verified by Toppr 2 =2πr(h+r)=2× 7 22

×(70)(100+70)=7.48 m

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## It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square metres of the sheet are required for the same?

It is given that it is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. We have found that 7.48 m² of the sheet is required for making the cylindrical tank.

## It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square metres of the sheet are required for the same?

**Solution:**

We know that,

Diameter = 2 × radius

Let the radius and height of the cylinder be 'r' and 'h' respectively.

Height of the tank, h = 1 m

Radius of the tank, r = 140 cm / 2 = 70/100 m = 0.7 m

Total surface area of the closed cylindrical tank = 2 π r (r + h)

= 2 × 22/7 × 0.7 m × (0.7 m + 1 m)

= 4.4 m × 1.7 m = 7.48 m²

7.48 m² of the sheet is required for making the cylindrical tank.

**☛ Check:**NCERT Solutions for Class 9 Maths Chapter 13

**Video Solution:**

## It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square metres of the sheet are required for the same?

Class 9 Maths NCERT Solutions Chapter 13 Exercise 13.2 Question 2

**Summary:**

It is given that it is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. We have found that 7.48 m² of the sheet is required for making the cylindrical tank

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## Ex 13.2, 2

Ex 13.2, 2 It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square meters of the sheet are required for the same? Here the cylindrical tank is closed So, we need to find total surface area of cylinder in m2 Height (h) of cy

**Check sibling questions**

## Ex 13.2, 2 - Chapter 13 Class 9 Surface Areas and Volumes (Term 2)

Last updated at Jan. 8, 2020 by Teachoo

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### Transcript

Ex 13.2, 2 It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square meters of the sheet are required for the same? Here the cylindrical tank is closed So, we need to find total surface area of cylinder in m2 Height (h) of cylindrical tank = 1 m Base radius (r) of cylindrical tank = /2 = (140/2) cm = 70/100 m Area of sheet required = Total surface area of tank = 2 r(r + h) = 2 22/7 0.7(0.7+1) m2 = 2 22 0.1(1.7) m2 ` = 7.48 m2

**Next**: Ex 13.2, 3 Important →

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### Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.

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