AREA CALCULATIONS Many composite surfaces can be divided up into primitive areas. These are the areas of common shapes such as circle, triangle, or rectangle. Below are some useful 2D and 3D area formulas that you should memorize. Area Formulas Triangle ^=글아 I rapezoic 1=9+611 Rectangle n-sided Lolygon Parallelogram Circle Area Formulas Ellipse A= Tab Right Circular Cone A=TR=TRVR' +B Abatom = aRe Arosal = A, + Aboriom Cylinder 4, = 2m Rh Alop=Ahoro=TR2 Acoral = A, + App + Abotion Sphere 1 - 4m R° AA " @ mylearning.suny