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www.web-formulas.com/Math_Formulas/Geometry_Perimeter_of_Polygon.aspx

4-sided polygon with two pairs of parallel sides. Pentagon. 5-sided polygon ...

bookbuilder.cast.org/view_print.php?book=38142

A quadrilateral is a closed figure with 4 sides. Some shapes that are classified as quadrilaterals are square, rectangle, parallelogram, rhombus, and trapezoid.

byjus.com/maths/polygon

For example, a quadrilateral has four sides, therefore, the sum of all the interior angle is given by: Sum of interior angles of 4-sided polygon = (4 – 2) × 180°.

www.infoplease.com/math-science/mathematics/numbers-formulas/polygons-how-many-sides

A geometrical figure with three or more sides is called a polygon or a polyhedron. Here are the names for some polygons.

www.nuffieldfoundation.org/sites/default/files/files/FSMQ%20What%20am%20I.pdf

I have 2 pairs of parallel, equal sides, but my sides are not all equal. I have no right angles. What am I? I am a parallelogram. I am a 2D shape. I have 3 sides.

mattjohnblake.wordpress.com/2012/09/25/can-you-have-a-three-sided-three-dimensional-shape

Sep 25, 2012 ... The fewest sides i can imagine a 2-dimensional shape having would be 3, a simple triangle. But you can say you can get a semicircle, where ...

www.mathswithmum.com/naming-2d-shapes

Oct 23, 2017 ... 2D means 2-Dimensional. A 2D shape has two dimensions, which are length and width. A 2D shape is a shape that has no thickness. If drawn ...

www.numbernut.com/numbersandcounting/shapes-2d.html

That a triangle with two (2) sides of equal length and the third side is different. Quadrilaterals and Squares. Samples of quadrilaterals. A quadrilateral is a shape  ...

www.herne-bay.kent.sch.uk/wp-content/uploads/2016/02/2D20and203D20shapes.pdf

A corner is where 2 sides meet. E.g. a triangle has 3 straight sides and 3 corners, whereas a circle has 1 curved side but no corners. 3D shapes. A 3D shape is a ...

www.learnalberta.ca/content/kes/pdf/or_cf_math_ss_b_01_id2d.pdf

A stop sign is an 8-sided polygon called an octagon and a yield sign is a 3-sided polygon called a triangle. Quadrilaterals. Rectangles and squares have four sides ...