Geometry, Unit 6: Quadrilaterals and Polygons. 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.
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- What is a quadrilateral?
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A polygon with four sides- What is the sum of the interior angles of any quadrilateral?
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360 degrees- What is a parallelogram?
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A quadrilateral with two pairs of parallel sides- What is true about opposite sides of a parallelogram?
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They are congruent- What is true about opposite angles of a parallelogram?
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They are congruent- What is true about consecutive angles of a parallelogram?
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They are supplementary- What is true about the diagonals of a parallelogram?
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They bisect each other- What is a rectangle?
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A parallelogram with four right angles- What is special about a rectangle's diagonals, beyond a general parallelogram?
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They are congruent- What is a rhombus?
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A parallelogram with four congruent sides- What is special about a rhombus's diagonals?
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They are perpendicular and bisect the angles- What is a square?
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A parallelogram that is both a rectangle and a rhombus- What is a trapezoid?
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A quadrilateral with exactly one pair of parallel sides- What are the parallel sides of a trapezoid called?
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The bases- What is an isosceles trapezoid?
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A trapezoid whose non-parallel sides (legs) are congruent
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