5. Triangle ABC has an angle of 90 degrees at B. Point A is on the y axis, AB is part of the line x-2y+8=0 and C is the point (6,2)
(iii) Answer = AB equals the square root of 20
BC equals the square root of 20
Area of triangle equals 10
(iv) Using your answer to (iii), find the length of the perpendicular from B to AC.
I don't even know where to start here, what is the method for figuring this out? And do they mean a line perpendicular to AC meeting B?

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ok just making sure, the stuff you have for (iii) are distances you've already solved for?

Yes, and I checked the answers at the back of my book already so they are definitely correct.

Would it help to upload a picture of the triangle?

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