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# C2 Maths Question (Help Needed): Watch

1. Question has been attached!
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2. (Original post by creativebuzz)
Question has been attached!
What is your question? The minimum distance?

Calculate the distance of the centre of circle from the line
3. (Original post by creativebuzz)
Question has been attached!
with just C2 knowledge

FIRST DRAW A DIAGRAM TO FOLLOW THE PLAN

• find gradient of the line
• determine equation of a perpendicular to this line which passes through the centre of the circle.
• solve equations of the two lines simultaneously to find point of intersection.
• find the distance of that point to the centre of the circle
• ....
4. (Original post by TeeEm)
with just C2 knowledge

FIRST DRAW A DIAGRAM TO FOLLOW THE PLAN

• find gradient of the line
• determine equation of a perpendicular to this line which passes through the centre of the circle.
• solve equations of the two lines simultaneously to find point of intersection.
• find the distance of that point to the centre of the circle
• ....
Ah thank you, I managed to get the answer! But what I still don't seem to understand is why was the reasoning behind finding the perpendicular? (I'm not arguing, I just really want to understand the reasoning behind everything)!
5. (Original post by creativebuzz)
Question has been attached!

Just draw yourself a random line and a random dot and see how you'd find the minimum distance between the two.

Does that give you any clues.

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Updated: December 30, 2014
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