Question 764291

 {{{c^2=a^2+b^2}}} 

if {{{a=15}}} and {{{ b=20}}}, then

 {{{c^2=15^2+20^2}}} 

{{{c^2=225+400}}} 

{{{c^2=625}}} 

{{{c=sqrt(625)}}} 

{{{c=25}}}