இந்த சரிவக வடிவ தோட்டத்தின் பரப்பளவு என்ன? (அனைத்து அளவீடுகளும் செ.மீட்டரில் உள்ளன)

NTPC-30-03-2016-Shift-3 solutions - Reviewed images Q6

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NTPC Tier I (Held On: 30 Mar 2016 Shift 3)
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  1. 60 சதுர செ.மீ
  2. 180 சதுர செ.மீ
  3. 210 சதுர செ.மீ
  4. 240 சதுர செ.மீ

Answer (Detailed Solution Below)

Option 4 : 240 சதுர செ.மீ
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Detailed Solution

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கொடுக்கப்பட்ட படத்திலிருந்து,

NTPC-30-03-2016-Shift-3 solutions - Reviewed images Q6a

ΔBEF இலிருந்து, நமக்குக் கிடைக்கும்

⇒ BF2 = BE2 + EF2

⇒ 132 = 122 + EF2

⇒ EF2 = 132 - 122 = 169 - 144 = 25

⇒ EF = 5 செ.மீ

படத்திலிருந்து,

⇒ CD = EF = 5 செ.மீ மற்றும் AB = DE = 15 செ.மீ

⇒ CF = CD + DE + EF = 5 + 15 + 5 = 25 செ.மீ

சரிவகத்தின் பரப்பளவு = ½ x BE x (AB + CF) = ½ x 12 (15 + 25) = 240 சதுர செ.மீ

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