আয়তক্ষেত্রের ক্ষেত্রফল কত যার কর্ণ 17 সেমি এবং প্রস্থ 8 সেমি?

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RRB ALP Electrician 22 Jan 2019 Official Paper (Shift 2)
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  1. 120 সেমি2
  2. 125 সেমি2
  3. 128 সেমি2
  4. 136 সেমি2

Answer (Detailed Solution Below)

Option 1 : 120 সেমি2
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প্রদত্ত:

আয়তক্ষেত্রের প্রস্থ = 8 সেমি

আয়তক্ষেত্রের কর্ণ = 17 সেমি

অনুসৃত সূত্র :

(কর্ণ)2 = (দৈর্ঘ্য)2 + (প্রস্থ)2

আয়তক্ষেত্রের ক্ষেত্রফল = দৈর্ঘ্য × প্রস্থ

গণনা:

(কর্ণ)2 = (দৈর্ঘ্য)2 + (প্রস্থ)2

⇒ (17)2 = (দৈর্ঘ্য)2 + (8)2

⇒ দৈর্ঘ্য = √(289 - 64)

⇒ দৈর্ঘ্য = √225

⇒ দৈর্ঘ্য = 15 সেমি

আয়তক্ষেত্রের ক্ষেত্রফল = দৈর্ঘ্য × প্রস্থ 

⇒ 15 × 8

⇒ 120 সেমি2

∴ আয়তক্ষেত্রটির ক্ষেত্রফল 120 সেমি2

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