Question

the volume of a 1-metre iron rod is 1386 cu.cm. find its diameter.​

Answer 1

Answer:

Step-by-step explanation:

Volume of iron rod=1386 cu                               h=1m

= TT*r2*h=22/7*r2*1=22/7 *r*r=1386 cu=r*r=1386*7/22=441

r2=441

r= root of 441=21

d=2r=2*21=42cm

Answer 2

Answer:

Solution:-

Given : Volume of rod = 1386 cu cm and height = 1 m or 100 cm

Volume of rod (iron rod is in the shape of cylinder) = πr²h

1386 = 22/7*r²*100

⇒ r² = (1386*7)/2200

⇒ r² = 9702/2200

⇒ r² = 4.41

⇒ r = √4.41

⇒ r = 2.1 cm

Diameter = 2.1 ×2 

Diameter = 4.2 cm

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