Main content
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Congruent shapes & transformationsNon-congruent shapes & transformations
Practice
Congruence & transformationsGet 3 of 4 questions to level up!
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Congruent triangles & the SSS postulate/criterionTriangle congruence postulates/criteriaWhy SSA isn't a congruence postulate/criterionDetermining congruent trianglesTriangle congruence review
Practice
Determine congruent trianglesGet 5 of 7 questions to level up!
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Angles in a triangle sum to 180° proofProofs concerning isosceles trianglesProofs concerning equilateral triangles
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Corresponding angles in congruent trianglesIsosceles & equilateral triangles problemsFinding angles in isosceles trianglesFinding angles in isosceles triangles (example 2)
Practice
Find angles in congruent trianglesGet 3 of 4 questions to level up!
Find angles in isosceles trianglesGet 3 of 4 questions to level up!
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Proof: Opposite sides of a parallelogramProof: Diagonals of a parallelogramProof: Opposite angles of a parallelogramProof: The diagonals of a kite are perpendicularProof: Rhombus diagonals are perpendicular bisectorsProof: Rhombus area
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Geometry proof problem: midpointGeometry proof problem: congruent segmentsGeometry proof problem: squared circle
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Geometric constructions: perpendicular bisectorGeometric constructions: perpendicular lineGeometric constructions: angle bisector

About this unit

Learn what it means for two figures to be congruent, and how to determine whether two figures are congruent or not. Use this immensely important concept to prove various geometric theorems about triangles and parallelograms.