Videos and lessons to help High School students learn how to
construct a tangent line from a point outside a given circle to
the circle.

Common Core: HSG-C.A.4

Construction - Tangent to a Circle From a Point Outside the Circle

How to draw the tangent lines to a circle when given a specific point outside the circle.

Tangent through a point not on a circle

How to use a compass to construct a line tangent to a circle and through a point NOT on the circle.

Tangents to a Circle

Tangents from a point outside a circle are congruent. Use the slider or drag the orange point to change the figure.

Tangents to a Circle from the Wolfram
Demonstrations Project by Jay Warendorff

Construction of Tangents to a circle

This applet shows how to construct tangents to a circle from a point outside the circle.

Drag the Step Slider to see each step

Drag point B to change the radius of the circle and explore what happens

- when the point A is inside the circle?

- when the point A coincides with point M?

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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