Angle at Center

Change the angle at center and the subtending arc.
Angle at Center

Angle at circumference

Compare the marked angles. When is one greater / smaller than the other?
Angle at circumference

mark equal angles

How can you make the angle at D the same size as the angle at B?
mark equal angles

exploring tangent-chord angle

Exploring tangent-chord angle
exploring tangent-chord angle

explain difference in angles with circle

Explain how θ is greater or smaller than the angle on circumference subtended by the same arc.
explain difference in angles with circle

equidistant from 2 points

equidistant from two points
equidistant from 2 points

Annulus

Find the area of the annulus (purple ring) based on the given the chord length of CD.
Annulus

circular 9 dots template

seeing tangent and chord from an alternate angle

discussion about teaching tangent-chord angle theorem
Link to Google Doc [br][[url=https://docs.google.com/document/d/1yGEBZkK5cL_9S8yYMFqRuwO35XImZPqFp5unXPQlhSw/edit?usp=sharing]https://docs.google.com/document/d/1yGEBZkK5cL_9S8yYMFqRuwO35XImZPqFp5unXPQlhSw/edit?usp=sharing[/url]]

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