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High School Geometry
Domain Congruence
Cluster Prove geometric theorems
Standard Prove theorems about lines and angles. <span class='clarification'>Theorems include: vertical angles are congruent; when a transversal crosses parallel lines, alternate interior angles are congruent and corresponding angles are congruent; points on a perpendicular bisector of a line segment are exactly those equidistant from the segment's endpoints.</span>

HSG-CO.C.9

Prove theorems about lines and angles. Theorems include: vertical angles are congruent; when a transversal crosses parallel lines, alternate interior angles are congruent and corresponding angles are congruent; points on a perpendicular bisector of a line segment are exactly those equidistant from the segment's endpoints.

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Tasks

Tangent Lines and the Radius of a Circle
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Points equidistant from two points in the plane
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Congruent angles made by parallel lines and a transverse
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