quadrilaterals
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The primary difference between a square and a triangle is the number of sides each has. The square has four while the triangle has three. Let's look a bit further.The triangle has no restrictions on its shape; its a three-sided figure with line segments connected together. The square on the other hand has four sides of equal length. This will also mean it has four right angles in its interior. A square is a special case of a rectangle, which is a special case of a quadrilateral. Lastly, the term quadrilateral is the general term for a four-sided figure.
A quadrilateral is the general term for figures with four sides. A kite, rhombus, trapezoid are all examples of quadrilaterals which need not have any right angles. (A rhombus cannot have any)
A plane figure having four sides and four angles
It is called a quadrilateral. This is the general term for a four-sided polygon, but if at least two sides are equal or two angles are equal, it has a more specific name.
heptacontagon is the scientific term for a 70 sided shape.