alleryThe acute angle between two lines with slopes $1$ and $0$ is:
A$30^\circ$
B$60^\circ$
C$45^\circ$
D$90^\circ$
Answer & Solution
Correct answer: C. $45^\circ$
tanθ = |(1−0)/(1+1·0)| = 1, so θ = 45°.
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