How to find the coordinates of the tangency points on direct common tangent line











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I have to find the coordinates of the tangent points on 2 semi-circles that the center of one of them has an offset of x and y from the center of the other one, I need to draw a tangent line between them, hence the starting and ending point of this line will not be on the semicircles , but I should continue the semi-circles along their perimeter to these start and endpoints, I need to know how could I calculate the start and end point coordinates.



I need the most general case, in which the radius of two circles are not equal



Circles










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  • Your question is too vague. You don't even say whether your semi-circles have the same radius or not ...
    – Jean Marie
    Nov 19 at 20:38










  • Have you chcked the image? you can visually say if they have or not ? but I want the most general case and will edit the question. is my question too vague just because of this point ?
    – FabioSpaghetti
    Nov 19 at 20:48










  • I hadn't seen there is an image...
    – Jean Marie
    Nov 19 at 20:51










  • No, your question is too vague because there is no answer possible unless you give the coordinates of the center of the first circle and the radii of the two circles.
    – Jean Marie
    Nov 19 at 20:56










  • The coordinates of the center of the first circle is known and also the radii of both circles !! As far as I see, I have tagged it in analytical geometry, so it should have an analytical answer. clearly every paramter can be counted in if it's required to be one of the known
    – FabioSpaghetti
    Nov 19 at 21:54

















up vote
0
down vote

favorite












I have to find the coordinates of the tangent points on 2 semi-circles that the center of one of them has an offset of x and y from the center of the other one, I need to draw a tangent line between them, hence the starting and ending point of this line will not be on the semicircles , but I should continue the semi-circles along their perimeter to these start and endpoints, I need to know how could I calculate the start and end point coordinates.



I need the most general case, in which the radius of two circles are not equal



Circles










share|cite|improve this question
























  • Your question is too vague. You don't even say whether your semi-circles have the same radius or not ...
    – Jean Marie
    Nov 19 at 20:38










  • Have you chcked the image? you can visually say if they have or not ? but I want the most general case and will edit the question. is my question too vague just because of this point ?
    – FabioSpaghetti
    Nov 19 at 20:48










  • I hadn't seen there is an image...
    – Jean Marie
    Nov 19 at 20:51










  • No, your question is too vague because there is no answer possible unless you give the coordinates of the center of the first circle and the radii of the two circles.
    – Jean Marie
    Nov 19 at 20:56










  • The coordinates of the center of the first circle is known and also the radii of both circles !! As far as I see, I have tagged it in analytical geometry, so it should have an analytical answer. clearly every paramter can be counted in if it's required to be one of the known
    – FabioSpaghetti
    Nov 19 at 21:54















up vote
0
down vote

favorite









up vote
0
down vote

favorite











I have to find the coordinates of the tangent points on 2 semi-circles that the center of one of them has an offset of x and y from the center of the other one, I need to draw a tangent line between them, hence the starting and ending point of this line will not be on the semicircles , but I should continue the semi-circles along their perimeter to these start and endpoints, I need to know how could I calculate the start and end point coordinates.



I need the most general case, in which the radius of two circles are not equal



Circles










share|cite|improve this question















I have to find the coordinates of the tangent points on 2 semi-circles that the center of one of them has an offset of x and y from the center of the other one, I need to draw a tangent line between them, hence the starting and ending point of this line will not be on the semicircles , but I should continue the semi-circles along their perimeter to these start and endpoints, I need to know how could I calculate the start and end point coordinates.



I need the most general case, in which the radius of two circles are not equal



Circles







discrete-mathematics analytic-geometry






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited Nov 19 at 20:48

























asked Nov 19 at 20:26









FabioSpaghetti

11




11












  • Your question is too vague. You don't even say whether your semi-circles have the same radius or not ...
    – Jean Marie
    Nov 19 at 20:38










  • Have you chcked the image? you can visually say if they have or not ? but I want the most general case and will edit the question. is my question too vague just because of this point ?
    – FabioSpaghetti
    Nov 19 at 20:48










  • I hadn't seen there is an image...
    – Jean Marie
    Nov 19 at 20:51










  • No, your question is too vague because there is no answer possible unless you give the coordinates of the center of the first circle and the radii of the two circles.
    – Jean Marie
    Nov 19 at 20:56










  • The coordinates of the center of the first circle is known and also the radii of both circles !! As far as I see, I have tagged it in analytical geometry, so it should have an analytical answer. clearly every paramter can be counted in if it's required to be one of the known
    – FabioSpaghetti
    Nov 19 at 21:54




















  • Your question is too vague. You don't even say whether your semi-circles have the same radius or not ...
    – Jean Marie
    Nov 19 at 20:38










  • Have you chcked the image? you can visually say if they have or not ? but I want the most general case and will edit the question. is my question too vague just because of this point ?
    – FabioSpaghetti
    Nov 19 at 20:48










  • I hadn't seen there is an image...
    – Jean Marie
    Nov 19 at 20:51










  • No, your question is too vague because there is no answer possible unless you give the coordinates of the center of the first circle and the radii of the two circles.
    – Jean Marie
    Nov 19 at 20:56










  • The coordinates of the center of the first circle is known and also the radii of both circles !! As far as I see, I have tagged it in analytical geometry, so it should have an analytical answer. clearly every paramter can be counted in if it's required to be one of the known
    – FabioSpaghetti
    Nov 19 at 21:54


















Your question is too vague. You don't even say whether your semi-circles have the same radius or not ...
– Jean Marie
Nov 19 at 20:38




Your question is too vague. You don't even say whether your semi-circles have the same radius or not ...
– Jean Marie
Nov 19 at 20:38












Have you chcked the image? you can visually say if they have or not ? but I want the most general case and will edit the question. is my question too vague just because of this point ?
– FabioSpaghetti
Nov 19 at 20:48




Have you chcked the image? you can visually say if they have or not ? but I want the most general case and will edit the question. is my question too vague just because of this point ?
– FabioSpaghetti
Nov 19 at 20:48












I hadn't seen there is an image...
– Jean Marie
Nov 19 at 20:51




I hadn't seen there is an image...
– Jean Marie
Nov 19 at 20:51












No, your question is too vague because there is no answer possible unless you give the coordinates of the center of the first circle and the radii of the two circles.
– Jean Marie
Nov 19 at 20:56




No, your question is too vague because there is no answer possible unless you give the coordinates of the center of the first circle and the radii of the two circles.
– Jean Marie
Nov 19 at 20:56












The coordinates of the center of the first circle is known and also the radii of both circles !! As far as I see, I have tagged it in analytical geometry, so it should have an analytical answer. clearly every paramter can be counted in if it's required to be one of the known
– FabioSpaghetti
Nov 19 at 21:54






The coordinates of the center of the first circle is known and also the radii of both circles !! As far as I see, I have tagged it in analytical geometry, so it should have an analytical answer. clearly every paramter can be counted in if it's required to be one of the known
– FabioSpaghetti
Nov 19 at 21:54

















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