Straight Line Question 236
Question: If the line segment joining the points $ A(a,b) $ and $ B(c,d) $ subtends an angle $ \theta $ at the origin, then $ \cos \theta = $
Options:
A) $ \frac{ac+bd}{\sqrt{(a^{2}+b^{2})(c^{2}+d^{2})}} $
B) $ \frac{ab+cd}{\sqrt{(a^{2}+b^{2})(c^{2}+d^{2})}} $
C) $ \frac{ad+bc}{\sqrt{(a^{2}+b^{2})(c^{2}+d^{2})}} $
D) None of these
Correct Answer: A
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Answer:
Solution:
BETA
