Question

7. Manisha cut 4 circles of radius 3 cm each from a rectangular metal sheet of length 12 cm and breadth 10 cm. She then melts the remaining sheet to make a 6 m long wire. How much area of the sheet does she use to make 1 m of the wire? (Take n = 3.14) ​

Answer 1

Answer:

6.96cm²

Step-by-step explanation:

Total area of rectangular sheet = L × B

= 12×10

= 120cm²

total area of a circular sheet = πr²

= 3.14 × 3²

= 28.26 cm²

So, total area of 4 circular sheet = 4 × 28.26

= 113.04cm²

Now,

area of the sheet does not use to make wire is = area of rectangular sheet - area of 4 circular sheet

= 120-113.04

=6.96 cm²