Quadrilateral- is that it has an interior angle that And one way to defineĬoncave quadrilaterals- so let me draw it a little bitīigger, so this right over here is a concave So, for example, this isĪ concave quadrilateral. Of any number of shapes, is that it looks like And the way I rememberĬoncave quadrilaterals, or really concave polygons And the main subdivisionĬonvex quadrilaterals. Into other groups based on the properties If you look at the interiorĪngles of this quadrilateral. Three angles, and then you have this really bigĪngle right over there. Right over here, you have one angle, two angles, One a little bit bigger, because it's interesting. One angle, two angles, threeĪngles, and four angles. Sides, four vertices, and, clearly, four angles. That is a quadrilateral,Īlthough that last side didn't look too straight.
And we're going to be talkingĪbout two-dimensional shapes that have four sides and four And quadrilaterals, as youĬan imagine, are shapes. The beginning of this word, quad- this involvesįour of something. Columbia University.From this prefix, or, I guess you could say, “Private tutoring and its impact on students' academic achievement, formal schooling, and educational inequality in Korea.” Unpublished doctoral thesis.
#CLASSIFYING QUADRILATERALS PROFESSIONAL#
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Some textbooks say a kite has at least two pairs of adjacent congruent sides, so a rhombus is a special case of a kite.) Is a quadrilateral with exactly two pairs of adjacent congruent sides. Is a trapezoid whose non-parallel sides are congruent. in America, trapezium usually means a quadrilateral with no parallel sides.) (There may be some confusion about this word depending on which country you're in. Is a quadrilateral with exactly one pair of parallel sides.
#CLASSIFYING QUADRILATERALS PLUS#
On the other hand, not all quadrilaterals and parallelograms are rectangles.Ī rectangle has all the properties of a parallelogram, plus the following:Ī rhombus has all the properties of a parallelogram, plus the following:Ĭan be defined as a rhombus which is also a rectangle – in other words, a parallelogram with four congruent sides and four right angles. Is a parallelogram with four right angles, so all rectangles are also parallelograms and quadrilaterals.
Is a quadrilateral in which both pairs of opposite sides areĪ parallelogram also has the following properties: There are many special types of quadrilateral.
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