रेखा  और तल  3x + 4y + z + 5 = 0 के बीच का कोण ज्ञात कीजिए। 

Answer (Detailed Solution Below)

Option 1 :
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NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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संकल्पना:

यदि θ रेखा  और तल a2 x + b2 y + c2 z + d = 0 के बीच का कोण है, तो

  है। 

गणना:

दिया गया है: रेखा का समीकरण  है और तल का समीकरण 3x + 4y + z + 5 = 0 है। 

चूँकि हम जानते हैं कि रेखा  और तल a2 x + b2 y + c2 z + d = 0 के बीच का कोण निम्न दिया गया है:

यहाँ, a1 = 3, b1 = - 1, c1 = 2, a2 = 3, b2 = 4 और c2 = 1.

⇒ a1 ⋅ a2 + b1 ⋅ b2 + c1 ⋅ c2 = 9 - 4 + 2 = 7

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