The coordinates of three points are A(-1,-3), B (2,3) and C(6,k)
If AB is perpendicular to BC then find
a) The value of k
b) the gradient of AC
c) the acute angle that AC makes with the x-axis.
My answer for (b) is 4/7 but the actual answer is 4/5. And I have problems with (c) too.
Kindly please show your working. Thank you very much.
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Answer:
hendbjd kk sjdbbdhsjjsbahajavdvdbdh
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