একটি ত্রিভুজের তিনটি বাহুর দৈর্ঘ্য 3 km, 4 km ও 5 km. ত্রিভুজটির ক্ষেত্রফল কত?

Created: 11 months ago | Updated: 2 weeks ago

Updated: 2 weeks ago

ক

$12 k m^{2}$
খ

$20 k m^{2}$
গ

$15 k m^{2}$
ঘ

$6 k m^{2}$

413

ব্যাখ্যাঃ

3, 4, 5 হলো পিথাগোরিয়ান প্যার্টান, যা একটি সমকোণী ত্রিভুজের বাহু নির্দেশ করে। অর্থাৎ, $3^{2} + 4^{2} = 9 + 16 = 25 = 5^{2}$

সমকোণী ত্রিভুজের ক্ষেত্রফল = (1/2) ভূমি $\times$ উচ্চতা

$= \frac{1}{2} \times 3 \times 4 = 6 k m^{2}$

Najjar Hossain Raju

8 months ago

MCQ: 36 CQ: 15

Practice

ত্রিভুজের তিন বাহু দেওয়া থাকলে ক্ষেত্রফল

ত্রিভুজের তিন বাহু দেওয়া আছে :

মনে করি, △ABC এর BC = a, CA = b এবং AB = c । এর পরিসীমা 2s = a + b + c l AD ⊥ BC আঁকি।

ধরি, BD = x তাহলে, CD = a - x

△ABD এবং △ACD সমকোণী।

আবার,

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একটি ত্রিভুজের তিনটি বাহুর দৈর্ঘ্য 3 km, 4 km ও 5 km. ত্রিভুজটির ক্ষেত্রফল কত?

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