Lesson plan

Identify angles by applying relationships of tangent lines and radii

teaches Common Core State Standards CCSS.Math.Content.HSG-C.A.2 http://corestandards.org/Math/Content/HSG/C/A/2

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Big Ideas: A radius that intersects a tangent line on the circle is perpendicular at its point of intersection. This task addresses the concept behind the relationship between a radius and its connection to a tangent line. It also recalls the relationship of the sum of the interior angle measure of the polygons. Vocabulary: tangent, radius, pentagon, perpendicular, bisector