Answer:
Radius of the circular garden (r) = 21 m \[\Rightarrow \] Radius of the circular garden (r) \[=\frac{21}{2}\text{m}\] \[\therefore \] Circumference of the circular garden \[=2\pi r\] \[\text{= 2 }\!\!\times\!\!\text{ }\frac{\text{22}}{\text{7}}\text{ }\!\!\times\!\!\text{ }\frac{\text{21}}{\text{2}}\text{m = 66 m}\] \[\Rightarrow \] Length of the rope to make 1 round of fence \[=\text{66 m}\] \[\Rightarrow \] Length of the rope to make 2 rounds of fence \[=\text{66}\times \text{2m}=\text{132 m}\] \[\therefore \] Cost of the rope = ` \[132\times 4\] = ` 528
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