What is a tangent?  A tangent (Line AB) is a line that intersects the outside of the circle.  The point of tangency (Point P) is where the line intersects.

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Presentation transcript:

What is a tangent?  A tangent (Line AB) is a line that intersects the outside of the circle.  The point of tangency (Point P) is where the line intersects the circle. A B P

How many points of tangency can you have from one point?

What is the tangent-radius property?  A tangent-radius property is:  The line formed between the centre of the circle, O, and the point of tangency, P, forms and 90 degree angle with the tangent line, AB. A B P O

Why is the Pythagorean Theorem so important to us?  What shape do we have now?  What is the length of C? A B P O 10 4 C

Circle Tangents  What is a tangent?  How is it formed?  What is the tangent-radius property?  How important is the Pythagorean Theorem?  What do the interior angles of every triangle add up to?

Circle Tangents  The interior angles of every triangle add up to 180 degrees.  REMEMBER:  An isoceles triangle has two equal sides and two equal angles.  An equilateral triangle has three equal sides and three equal angles

Assignment  Pg. 388  #3-9, 11-14,15a  Then 17, 19