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Geometry The shape of things to come…

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Quadrilaterals

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**There are many different kinds of quadrilaterals**

There are many different kinds of quadrilaterals. All of them have certain things in common. But most importantly they all have four sides!

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**A quadrilateral that has at least one pair of parallel sides.**

Trapezoid: A quadrilateral that has at least one pair of parallel sides.

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**This shape is also a trapezoid.**

Parallelogram: Opposite sides are parallel and of equal length. The opposite angles are equal. This shape is also a trapezoid.

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**(It is also a parallelogram AND a trapezoid!)**

Rhombus: This parallelogram has four equal sides, but does not have four right angles. (It is also a parallelogram AND a trapezoid!)

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**Rectangle: Has two parallel pairs of lines and four right angles.**

(It is also a parallelogram AND a trapezoid.)

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**(It is also a parallelogram, a trapezoid, AND a rectangle!)**

Square: Has two parallel pairs of lines, four right angles, and all four sides are equal in length. (It is also a parallelogram, a trapezoid, AND a rectangle!)

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Triangles

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**Equilateral Triangle:**

All three sides are equal. Each angle is equal to 60°. Also called an acute-angled triangle.

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**It has a right angle (90°) in one of its corners.**

Right Triangle: It has a right angle (90°) in one of its corners.

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**Only two sides have the same length. Two angles are equal.**

Isosceles Triangle: Only two sides have the same length. Two angles are equal.

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**Each side is a different length. None of the angles are equal.**

Scalene Triangle: Each side is a different length. None of the angles are equal.

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