Question
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Answer (Detailed Solution Below)
Option 4 : Rs $3,300$
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Detailed Solution
सही उत्तर Rs $3,300$ है।
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prepsnap.in • Part -AQuestion:
The area of a circular park is $1386$ m². What is the cost of fencing it at Rs $25$ per metre? (Use $\pi = \frac{22}{7}$) / एक वृत्ताकार पार्क का क्षेत्रफल $1386$ वर्ग मीटर है। $25$ रु प्रति मीटर की दर से इसकी बाड़ लगाने की लागत कितनी होगी? ($\pi = \frac{22}{7}$ मानें)
1.
Rs $3,200$
2.
Rs $3,150$
3.
Rs $3,400$
4.
Rs $3,300$
Correct Answer: Rs $3,300$
$\pi r^2 = 1386$ gives $r^2 = 1386 \times \frac{7}{22} = 441$, so $r = 21$ m. Circumference = $2 \times \frac{22}{7} \times 21 = 132$ m. Cost = $132 \times 25 = 3300$. / $\pi r^2 = 1386$ से $r^2 = 1386 \times \frac{7}{22} = 441$, अतः $r = 21$ मीटर। परिधि = $2 \times \frac{22}{7} \times 21 = 132$ मीटर। लागत = $132 \times 25 = 3300$ रु।
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