question_answer 1)

Saima wants to put a lace on the edge of a circular table cover of diameter 1.5 m. Find the length of the lace required and also find its cost if one meter of the lace cost ` 15. \[\text{(Take  }\!\!\pi\!\!\text{  = 3}\text{.14)}\]

Answer:

                Diameter of the table cover \[=\text{1}.\text{5 m}\] \[\Rightarrow \]               Radius of the table cover (r) \[=\frac{1.5}{2}\text{m}\] \[\Rightarrow \]               Circumference of the table cover \[=2\pi r\] \[\text{= 2  }\!\!\times\!\!\text{  3}\text{.14  }\!\!\times\!\!\text{  }\frac{\text{1}\text{.5}}{\text{2}}\text{ m = 4}\text{.71m}\] \[\Rightarrow \]               Length of the lace required \[\text{= 4}\text{.71 m}\] \[\therefore \]                  Cost of the lace = ` \[\text{4}.\text{71}\times \text{15}\] = ` 70.65