Question 471924


 the endpoints of a {{{diameter}}} of a circle "{{{c}}}" are 
(-10, 5) and (4, 5). 

What is the {{{circumference}}} of circle "{{{c}}}"


 the {{{circumference}}} of circle is: {{{c=2r(pi)}}}

so, we need to find out what is {{{r}}} equal

given:

the endpoints of a {{{diameter}}} of a circle (-10, 5) and (4, 5)

the distance between then is equal to a {{{diameter}}}

let's find the distance between (-10, 5) and (4, 5)


*[invoke Distance_Formula_for_Coordinate_Plane -10, 5, 4, 5]


so, the distance {{{d=14}}}

we know that {{{r=d/2}}}...so, {{{r=14/2=7}}}

now we can find {{{c}}}


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

{{{c=2*7(pi)}}}

{{{c=14(pi)}}}