ΔABC ~ ΔPQR, ΔABC మరియు ΔPQR వైశాల్యాలు వరుసగా 64 సెం.మీ2 మరియు 81 సెం.మీ2 మరియు AD మరియు PT లు వరుసగా ΔABC మరియు ΔPQR ల యొక్క మధ్యగతాలు. PT = 10.8 సెం. అయితే, AD = ?

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SSC CGL 2020 Tier-I Official Paper 1 (Held On : 13 Aug 2021 Shift 1)
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  1. 9 సెం.మీ
  2. 12 సెం.మీ
  3. 8.4 సెం.మీ
  4. 9.6 సెం.మీ

Answer (Detailed Solution Below)

Option 4 : 9.6 సెం.మీ
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F1 Ashish Madhu 19.10.21 D2

ఇచ్చిన దత్తాంశం:

ΔABC ~ ΔPQR

ΔABC యొక్క వైశాల్యం = 64  సెం.మీ2

ΔPQR యొక్క వైశాల్యం = 81 సెం.మీ2

PT = 10.8 సెం.మీ

AD అనేది ΔABC యొక్క మధ్యగతము.

PT అనేది ΔPQR యొక్క మధ్యగతము

కాన్సెప్ట్:

రెండు సారూప్య త్రిభుజాల వైశాల్యాల నిష్పత్తి సంబంధిత భుజాలు & మధ్యగతముల వర్గాల నిష్పత్తికి సమానం.

ar(ΔABC)/ar(ΔPQR) = AD2/PT2

⇒ 64/81 = AD2/PT2 

⇒ √64/81 = AD/PT

⇒ 8/9 = AD/10.8 

∴ AD = 9.6 సెం.మీ

 

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