Question

an architect wants to build cylindrical pillars for a dome. the diameter of the cylindrical base of the pillar should be 70 cm and height 10 m. write the formula to find out the quantity of concrete mixture required to build the pillar are​

Answer 1

Answer:

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Answer 2

Answer:

Step-by-step explanation:

Given, diameter =70 cm

Thus r=35 cm =  

100

35

​  

 m =  

20

7

​  

 m

Also given h=4 m

Curved surface area of 1 pillar =2πrh

Curved surface area of 10 pillars =10×2πrh=20πrh

Cost= Rs.5×20πrh= Rs. 100×  

7

22

​  

×  

20

7

​  

×4

= Rs. 440

Therefore, cost of painting at the rate of Rs. 5 per square metre is Rs. 440.