Mathematics, 20.10.2020 18:01 rhelia

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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The coordinates of three points are A(-1,-3), B (2,3) and C(6,k) If AB is perpendicular to BC then...

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