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What is 2-D? We median two-dimensional. Aaaand... What is that? A 2-D thing is an object with no depth. The closestly you will certainly ever come to seeing one is a file cutout the a shape. Yet even that paper has a very tiny thickness, so it is truly 3-D. Friend might additionally hear words polygon. That"s another name because that a 2D object. We"re going to offer you a little overview of the polygons you may see in your math travels. Triangles
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A triangle is the generic name for a form with three (3) sides. There room different species of triangles. You can hear about an equilateral triangle. The is a triangle v all 3 of its sides at equal lengths. Another form is one isosceles triangle. That a triangle through two (2) sides of same length and the third side is different. Quadrilaterals and Squares
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A square is a shape with 4 (4) sides. You might hear about squares, rectangles, a rhombus, or a trapezoid. These room all different species of quadrilaterals. Squares have actually all sides with equal lengths and also right angles (90 level angles). A rhombus is really close come a square, bit it"s at a tilt so that there are no right angles. That is choose a diamond ~ above its side. Pentagons and also Hexagons
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Moving up in the variety of sides we discover pentagons with five (5) sides. Next in the variety of sides, we uncover hexagons. Hexagons have six (6) sides. Girlfriend can add even more sides come polygons. Over there is no limit. We"re also doing something various with these pics. You should recognize that a polygon might be any kind of shape, also all bent and funny. If all of your sides have actually equal lengths, you room a continuous polygon. Ellipses and also Circles
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What wake up if you only have actually one side? Is that possible? kind of. Ellipses space circular forms that could be circles or ovals. The border goes every the way around and there space no corners. Girlfriend could additionally think around it together a polygon through an boundless amount that sides that all blend together. Various other Shapes
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You will discover other types of forms in the mathematics world. Cardioids are favor circles through a dimple on one side. A great example of a cardioid is a heart shape. You will additionally find stars. Usual star shapes are the five-pointed kind. Stars are created by connecting the corners of forms with more than 4 sides. The perform goes on, yet not top top this page.

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Two-Dimensional shape Name Quiz- beat Activity
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Two-Dimensional form Memory Challenge- beat Activity

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Useful referral MaterialsWikipedia:https://en.wikipedia.org/wiki/Pre-algebraEncyclopædia Britannica:http://www.britannica.com/topic/mathematicsCollege that the Redwoods:http://mathrev.redwoods.edu/PreAlgText/


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