Question 1003872
a triangle with the points ({{{-7}}},{{{1}}}), ({{{2}}},{{{-6}}}) and ({{{-9}}},{{{-3}}})

{{{drawing( 600, 600, -10, 10, -10, 10,
circle(-7,1,.12),circle(2,-6,.12), circle(-9,-3,.12),
line(-7,1,2,-6),line(-7,1,-9,-3),line(-9,-3,2,-6),
 graph( 600, 600, -10, 10, -10, 10, 0)) }}}

let side {{{a}}} be the distance between points ({{{-7}}},{{{1}}}) and ({{{2}}},{{{-6}}})

*[invoke hummingbird_distance_2D -7, 1, 2, -6] 


{{{a=11.4}}}

let side {{{b}}} be the distance between points ({{{-7}}},{{{1}}}) and ({{{-9}}},{{{-3}}})

*[invoke hummingbird_distance_2D -7, 1, -9, -3]

{{{b=4.8}}}

let side {{{c}}} be the distance between points ({{{-9}}},{{{-3}}}) and ({{{2}}},{{{-6}}})

*[invoke hummingbird_distance_2D 2, -6, -9, -3]

{{{c=11.4}}}

than perimeter is:{{{P=a+b+c=11.4+4.8+11.4=27.6}}}