Download Tangent Radius Property

Circle Geometry – Video #1
Tangent-Radius Property
KLO’s: Understands and applies circle properties.
Learning Outcome (9SS1):

Solve problems and justify the solution strategy, using the Tangent-Radius Property
Example 1
1. Angle formed between the 1st tangent and the radius = __________.
2. Angle formed between the 2nd tangent and the radius = __________.
3. Angle formed between the 3rd tangent and the radius = __________.
LLR Math 9 – Circle Geometry Video #1 - Tangent – Radius Property (9SS1)
Vocab word
Definition
Radius
Tangent
Perpendicular
Point of
Tangency
Example 2
The point of tangency is where the radius touches the tangent forming a
___________ angle.
LLR Math 9 – Circle Geometry Video #1 - Tangent – Radius Property (9SS1)
Practice Question #1
(Determining the measure of < ABO knowing the Tangent-Radius property)
The measure of <OAB = _____ ,
therefore the <ABO = ____.
(Hint: What does the measure of all 3 angles in a triangle
equal?)
LLR Math 9 – Circle Geometry Video #1 - Tangent – Radius Property (9SS1)
Practice Question #2
(Determining the length of an unknown side of a right triangle knowing the TangentRadius property)
Show work below to solve for side d.
LLR Math 9 – Circle Geometry Video #1 - Tangent – Radius Property (9SS1)
Practice Question #3.
(Applying the Tangent-Radius property to solve a real world problem)
Show work below:
LLR Math 9 – Circle Geometry Video #1 - Tangent – Radius Property (9SS1)