Question 1135788
If {{{a = 100}}} inches, {{{b = 62}}} inches, and {{{C = 60}}}°, find {{{c}}}. 


use law of cosine

{{{c^2=a^2+b^2-2ab*cos(C)}}}

{{{c^2=100^2+62^2-2*100*62*cos(60)}}}

{{{c^2=10000+3844-12400*0.5}}}

{{{c^2=7644}}}

{{{c=sqrt(7644)}}}

{{{c=87.43}}}

{{{c}}}≈{{{87}}} inches