∆ABC मध्ये, AD हा मध्यक आहे आणि G हा AD वर केंद्रबिंदू आहे जसे की AG : GD = 2 : 1. नंतर ar (∆BDG) : ar (∆ABC) समान किती आहे?

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SSC CGL Previous Paper 53 (Held On: 10 June 2019 Shift 2)
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  1. 1 : 4
  2. 1 : 3
  3. 1 : 9
  4. 1 : 6

Answer (Detailed Solution Below)

Option 4 : 1 : 6
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जस आपल्याला माहित आहे,

F1 V.G Deepak 17.10.2019 D 4

AD हा मध्य आहे, म्हणून AD त्रिकोणाला दोन समान भागांमध्ये विभाजित करतो

ar ΔADB = ar ΔADC

ΔABD मध्ये

⇒ ar ΔBDG/ar ΔBGA = DG/AG

⇒ ar ΔBDG/ar ΔBGA = 1/2

ΔBDG चे क्षेत्रफळ = 1 एकक समजा

तर, ΔBGA चे क्षेत्रफळ = 2 एकक असेल

तर, ΔBAD = ar ΔBDG + ar ΔBGA = 1 + 2 = 3 युनिटचे क्षेत्रफळ

ΔABC चे क्षेत्रफळ = 2 x ar ΔBAD = 2 x 3 = 6 एकक

∴ ar ΔBDG : ar ΔABC = 1 : 6

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