CBSE Class 7 Answered
Anu wants to put a lace to decorate the edge of a circular cake having diameter 12 cm. Find the length of lace required and also the cost, if 1 cm of the lace costs Rs. 2.
Asked by Topperlearning User | 06 Jun, 2016, 04:36: PM
Expert Answer
Since the lace has to be put on the edge of the circular cake,
Length of lace required = circumference of the cake
Diameter of the cake = 12 cm
So, radius (r) = 
= 6 cm
Now, circumference of the cake = 2
r = 2 x 3.14 x 6 = 37.68 cm
Hence, the length of the lace required is 37.68 cm.
Cost of 1 cm lace = Rs. 2
Thus, the cost of 37.68 cm of lace = Rs. (37.68 x 2) = Rs. 75.36
Answered by | 06 Jun, 2016, 06:36: PM
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