Find a the area and b the 円周 of a circle that has a radius of 13 units. Express your answer in terms of pi

解

F in d a t h e a re a an d b t h e c i rc u m f ere n ce o f a c i rc l e t ha t ha s a r a d i u s o f 13 u ni t s . E x p ress yo u r an s w er in t er m s o f π

a re a : 169 π

c i rc u m f ere n ce : 26 π

十進法表記

530.92915 \dots, 81.68140 \dots

解答ステップ

指定された円の面積

r = 13 : A = 169 π

指定された円周

r = 13 : C = 26 π