May 18, 2015

<p>Students discover that a line is tangent to a circle at a given point if it is perpendicular to the radius drawn to that point.<br/>Students construct tangents to a circle through a given point.<br/>Students prove that tangent segments from the same point are equal in length.</p><p>Teacher and Student versions of full lesson from engageNY</p>

- Mathematics > General
- Mathematics > Geometry

- Grade 9
- Grade 10

Make sense of problems and persevere in solving them.

Reason abstractly and quantitatively.

Construct viable arguments and critique the reasoning of others.

Use appropriate tools strategically.

Attend to precision.

Look for and make use of structure.

Identify and describe relationships among inscribed angles, radii, and chords.