Ashifur August 8, 2023 - 16:44
Problem: একটি ত্রিভুজাকৃতি পার্বের তিন দিকে দৈর্ঘ্য যথাক্রমে ১৮ মিটার, ২৪ মিটার ও ৩০ মিটার । প্রতি বর্গমিটারে ১.২৫ টাকা হিসেবে ণ পার্কে ঘাস লাগাতে কত খরচ হবে?

View all: PRIME BANK(AB) | WRITTEN QUESTION (MATH) SOLVE | 1996

Correct Answer: উত্তরঃ ২৭০ টাকা ।

Explanation:

ত্রিভুজাকৃতি পার্কের পরিসীমা = (১৮ + ২৪ + ৩০) মি. = ৭২ মিটার

অর্ধ পরিসীমা =৭২/2 মিটার

পার্কের ক্ষেত্রফল

= $\sqrt{s(s−a)(s−b)(s−c)𝑠(𝑠−𝑎)(𝑠−𝑏)(𝑠−𝑐)}$

=$\sqrt{36(36−18)(36−24)(36−30)36(36−18)(36−24)(36−30)}$

=২১৬

প্রতি বা ১ বর্গমিটারে ঘাস লাগাতে খরচ হয় =১.২৫ টাকা

২১৬ বর্গমিটারে ঘাস লাগাতে খরচ হয় = (২১৬ x ১.২৫) =২৭০ টাকা

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