tangent-lines-and-circles

# Interactive video lesson plan for: ✶ TANGENT LINES AND CIRCLES

#### Activity overview:

Let's explore, identify, and describe the relationship between a circle and a tangent line and why the radius of a circle is perpendicular to the tangent where the radius intersects the circle.

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Learning Standards (High School Geometry: Circles):

Understand and apply theorems about circles.

HSG.C.A.2
Identify and describe relationships among inscribed angles, radii, and chords. Include the relationship between central, inscribed, and circumscribed angles; inscribed angles on a diameter are right angles; the radius of a circle is perpendicular to the tangent where the radius intersects the circle.

What is a tangent line to a circle?
Why is a tagent line and a radius perpendicular?
How many times does a tangent line cross a circle?

Image Credit: Emojis provided free by http://emojione.com

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