How to construct (draw) tangents to a circle through an external point - Math Open Reference
![How to construct (draw) tangents to a circle through an external point - Math Open Reference](https://www.mathopenref.com/images/constructions/consttangents/proof.gif)
This page shows how to draw the two possible tangents to a given circle through an external point with compass and straightedge or ruler. This construction assumes you are already familiar with constructing the perpendicular bisector of a line segment.
![](https://www.mathopenref.com/images/constructions/constparallel/proof.png)
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The number of tangents that can be drawn from a point outside a
![](https://www.sevenstring.org/data/avatars/m/28/28508.jpg?1495710753)
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![](https://math.libretexts.org/@api/deki/files/36998/clipboard_eae9fa7f353d93a26a65e5a3ef8f132f4.png?revision=1&size=bestfit&width=509&height=268)
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![](https://www.mathopenref.com/images/constructions/consttangents/step3.png)
Printable instructions for drawing tangents to a circle from a
![](https://i.ytimg.com/vi/y77U6Him8Zs/sddefault.jpg)
Construct a Tangent to a Circle from an External Point
![](https://i.ytimg.com/vi/rS0QoaCrmII/hq720.jpg?sqp=-oaymwEhCK4FEIIDSFryq4qpAxMIARUAAAAAGAElAADIQj0AgKJD&rs=AOn4CLAl5IabicQ_uA888OdshSOiaJ-siA)
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![](https://i.stack.imgur.com/iTHa9.png)
geometry - Finding tangents to a circle with a straightedge
![](https://www.mathopenref.com/images/constructions/constperplinepoint/proof.png)
How to construct (draw) a perpendicular at a point on a line
![](https://global.discourse-cdn.com/sketchup/original/2X/d/d6899531880e3879ca440ba8b5428f622dbc5b85.png)
Tangent lines to curves - SketchUp - SketchUp Community
The radius of circle O measures 6cm. AC and BC are tangent to circle O at points A and B respectively. OC bisects angles AOB and ACB. If m arc AB =