Geometry, Unit 3: Triangle Congruence. Key terms, formulas, and worked-example cues a high school student meets for this unit, building on prior units. Front: the term, formula name, or short problem cue. Back: the definition, formula, or solution method.
40 cards · basic cards · AI-written, checked twice. Edit anything.
- What is a triangle?
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A polygon with three sides and three angles- What is the sum of the interior angles of any triangle?
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180 degrees- What does it mean for two triangles to be congruent?
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All corresponding sides and angles are equal- What does SSS stand for in triangle congruence?
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Side-Side-Side, all three sides equal- What does SAS stand for in triangle congruence?
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Side-Angle-Side, two sides and the included angle equal- What does ASA stand for in triangle congruence?
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Angle-Side-Angle, two angles and the included side equal- What does AAS stand for in triangle congruence?
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Angle-Angle-Side, two angles and a non-included side equal- What does HL stand for, a congruence rule specific to right triangles?
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Hypotenuse-Leg, the hypotenuse and one leg equal- Why is AAA not a valid triangle congruence rule?
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Matching angles alone can produce similar, not necessarily congruent, triangles- What is CPCTC?
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Corresponding Parts of Congruent Triangles are Congruent, used after proving triangles congruent- What is an isosceles triangle?
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A triangle with at least two congruent sides- What is the Isosceles Triangle Theorem?
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If two sides of a triangle are congruent, the angles opposite them are also congruent- What is an equilateral triangle?
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A triangle with all three sides congruent- What is true about the angles of an equilateral triangle?
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All three angles are congruent, each measuring 60 degrees- What is a scalene triangle?
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A triangle with no congruent sides
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