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Diameter of a bangle is $7\ cm$. Thin stripe of gold is to be fixed on this bangle, find the cost(in Rs) for it at the rate of Rs.100 per $1\ cm$.
Given: Diameter of a bangle is $7\ cm$. Thin stripe of gold is to be fixed on this bangle, rate of gold $Rs.\ 100$ per $1\ cm$.
To do: To find the cost $( in\ Rs)$ of gold.
Solution:
Given the diameter of a bangle $( d) = 7\ cm$
Length of Thin strips of the gold fixed on the bangle $=$ Circumference of the circle
$=\pi d$
$= ( \frac{22}{7}) \times 7\ cm$
$= 22\ cm$
Now, Cost of the gold fixing $1\ cm = Rs.\ 100$
Cost of fixing $22\ cm = 100 \times 22$
$= Rs\ 2200$
Updated on: 10-Oct-2022
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