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Find the angle between the X-axis and the line joining the points `(3,-1)a n d (4,-2)dot` |
Answer» Let A(3,-1) and B(4,-2) be the given points and let m be the slope of the line AB. Then, `m=(-2-(-1))/(4-3)=(-2+1)/(1)=-1" "[therefore m=((y_(2)-y_(1)))/(x_(2)-x_(1))]` Let `theta` be the angle between the x-axis and the line AB. Then, `tan theta=m=-1=tan 45^(@)=tan(180^(@)-45^(@))=tan135^(@)` `therefore theta=135^(@)` Hence, teh required angle is `135^(@)` |
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