दिलेल्या आकृतीत, ∠ABD = 55° आणि ∠ACD = 30° , जर ∠BAC = y° आणि ∠BDC = x°, तर x - y चे मूल्य काय असेल?

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NTPC CBT-I (Held On: 5 Jan 2021 Shift 1)
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  1. 85
  2. 15
  3. 95
  4. 105

Answer (Detailed Solution Below)

Option 1 : 85
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
100 Qs. 100 Marks 90 Mins

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दिलेले आहे:

∠ABD = 55° आणि ∠ACD = 30°

गणना:

∠BAD = α आणि ∠CAD = β

अशाप्रकारे, BAC = y = α + β

अशाप्रकारे, ΔABD आणि ΔACD संदर्भात,

∠ADB = 180°- α - 55°

∠ADC = 180 ° - β - 30°

बिंदू D साठी,

∠ADB +∠ADC + x = 360°

⇒ 180°-  α - 55° +  180°-   β   - 30° + x =  360°

⇒ 360 - α - β - 85° + x = 360

⇒ x - (α + β) - 85° = 0

⇒ x - y - 85° = 0

⇒ x -y = 85°

∴ पर्याय (1) योग्य आहे.

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