Question 478014

given: 

radius {{{r=13mm}}}

Determine: 

(a) the area and 

(b) the circumference of the circle

(a) the area of the circle is

{{{A=r^2(pi)}}}

since {{{(pi)=3.14}}}, we will have

{{{A=(13mm)^2(3.14)}}}

{{{A=(169mm^2)(3.14)}}}

{{{A=530.66mm^2}}}


(b) the circumference {{{C}}} of the circle

{{{C=2r(pi)}}}

{{{C=2(13mm)(3.14)}}}

{{{C=(26mm)(3.14)}}}

{{{C=81.64mm}}}