বিদ্যুৎ, জ্বালানি ও খনিজ সম্পদ মন্ত্রণালয় || অফিস সহকারী/ অফিস সহকারী-কাম-কম্পিউটার মুদ্রাক্ষরিক / কম্পিউটার মুদ্রাক্ষরিক কাম- অফিস সহকারী/ হিসাব সহকারী (22-07-2023) || 2023
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Created:
4 weeks ago
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Updated:
7 hours ago
Created:
4 weeks ago
|
Updated:
6 hours ago
Created:
4 weeks ago
|
Updated:
6 hours ago
একটি বাগানের দৈর্ঘ্য 50 মিটার এবং প্রস্থ 40 মিটার।
অতএব, বাগানের ক্ষেত্রফল = (50×40) বর্গ মিটার
= 2000 বর্গ মিটার।
রাস্তাবাদে বাগানটির ক্ষেত্রফল = 1200 বর্গ মিটার।
অতএব, রাস্তাটির ক্ষেত্রফল = (2000 - 1200) বর্গ মিটার।
= 800 বর্গ মিটার।
এখন রাস্তাটির প্রস্থ = w ধরলে,
l = 50 মিটার
b =40 মিটার
চওড়া = w মিটার
অতএব, রাস্তাটির ক্ষেত্রফল = (I + b - 2w) × 2w
[ ফর্মূলা, মনে রাখার জন্য।]
= (50 +40 - 2w ) × 2w = 800 বর্গ মিটার
বা, ( 90 - 2w) × 2w = 800,
বা, 180w - 4w^2 = 800
বা, 4w^2 - 180w = - 800
বা, w^2 - 45w + 200 = 0,.
বা, w^2 - 40w - 5w + 200 = 0,
বা, w(w - 40) - 5(w - 40) = 0,
বা, (w - 40)(w - 5) = 0.
অতএব, w = 40 বা w = 5.
এখান, w = 5 ই গ্রাহ্য।
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