Answer the attachment..
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Answer:
r = 2.5 cm
h = 1.75 m = 175 cm
Curved Surface Area of one iron rod:
=> 2 × 22/7 × 25/10 × 175
=> 2750 sq cm
=> 0.275 sq m
For 12 iron rods = 0.275 × 12
= 3.3 sq m
Cost = Rs. 200 /-
=> 3.3 × 200
=> Rs. 660
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