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Mysterious Quadrilaterals Formulas for quadrilaterals by Garrett Lee / Mr. Muir / Geometry / A ‘Normal’ Quadrilaterals Hmm... nothing I DON’T KNOW! Special What do we do with this? “We are getting easier.” - Quadril-council What’s coming next? You’ll see... Trapezoids 18 ft • Formula: • {(Top + Bottom) * Height} / 2 15 ft 25 ft What about me? Example: {(18+25) * 15} / 2 = (33 * 15) / 2 = (495 / 2) ft² *Isosceles trapezoids included* Parallelogram 15 cm 12 cm • Formula: • Length * Height (Simple :) Example: 15 x 12 = 180 cm² Parallelogram’s Defeat Although I should say... two of the four sides are longer. Square Square Rhombuses Formula: (Length x Height) / 2 40 km 25 km Example: (25 x 40) / 2 = 1000 / 2 = 500 km² All sides have the same length! Rectangles Example : 15 x 4 = 60 mm² 15 mm RECTANGLE!! Interesti ng! Formula: Length x Height 4 mm All angles are 90 degrees! WHAT ?!? Trapezoids Parallelogram The Best One Is... Rhombus WHAT ?!? RECTANGLE!! SQUARES! 15 mi Formula: (One side)² *So simple!* Example: You guys can figure that out. Squares are perfect! All sides have the same length! + All the angles are 90 degrees! Now, are we done? Are we?? Song “Pentagons” Thank you for watching/listening! By Garrett Lee