AP EAMCET · Maths · Three Dimensional Geometry
The cosine of the angle \(A\) of the triangle with vertices \(A(1,-1,2), B(6,11,2), C(1,2,6)\) is
- A \(63 / 65\)
- B \(36 / 65\)
- C \(16 / 65\)
- D \(13 / 64\)
Answer & Solution
Correct Answer
(B) \(36 / 65\)
Step-by-step Solution
Detailed explanation
Direction ratios of \(\begin{aligned} A B & =6-1,11+1,2-2 \\ & =5,12,0\end{aligned}\) Direction ratios of \(\begin{aligned} A C & =1-1,2+1,6-2 \\ & =0,3,4\end{aligned}\) Now,…
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