ΔPQR  ΔBAC ആണെങ്കിൽ, ΔPQR ൽ, PQ = 7 സെമീ, QR = (2x - 1) സെമീ, ΔABC യിൽ, AB = 14 സെമീ, AC = (3x + 1) സെമീ ആണെങ്കിൽ, QR ന്റെ മൂല്യം എന്താണ്?

  1. 7 സെമീ
  2. 5 സെമീ
  3. 3 സെമീ
  4. 9 സെമീ

Answer (Detailed Solution Below)

Option 2 : 5 സെമീ
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Detailed Solution

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നൽകിയിരിക്കുന്നത്:

ΔPQR  ΔBAC,

ΔPQR- ൽ, PQ = 7 സെമീ, QR = (2x - 1) സെമീ

ΔABC- യിൽ, AB = 14 സെമീ, AC = (3x + 1) സെമീ

ഉപയോഗിച്ച ആശയം:

 ΔPQR ∼ ΔBACആണെങ്കിൽ (രണ്ട് ത്രികോണങ്ങളും തുല്യമാണ്)

⇒ PQ / BA = QR / AC = PR / BC

കണക്കുകൂട്ടൽ:

 PQ / BA = QR / AC

⇒ 7 / 14 = (2x - 1) / (3x + 1)

⇒ ½ = (2x - 1) / (3x + 1)

⇒ 3x + 1 = 4x - 2

⇒ x = 3

∴ QR = (2x - 1) = (6 - 1) = 5 സെമീ

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