Perimeter is the sum of the lengths of all sides.

            
                      Areas of triangles

              For any triangle use the formulas:                              

           
                        Equilateral triangle             Right triangle
                                
                                                            

                        Areas of Quadrilaterals
           Rectangle                Square                 Parallelogram            Trapezoid
           

                          Angle measures
         Sum of interior angles in any quadrilateral is 360º.
           Sum of interior angles in any convex polygon = (n - 2) 180º
            Example
                                         

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