Question 1011366


triangle {{{RST}}} is right triangle

given:
{{{RT=12}}} (hypotenuse)
{{{RS=5}}}

then we need third side {{{TS}}} which will be:


 {{{TS ^2=RT^2-RS^2}}}

{{{TS ^2=12^2-5^2}}}

{{{TS ^2=144-25}}}

{{{TS ^2=119}}}

{{{TS =sqrt(119)}}}

{{{TS =10.90871211463571}}}

or, approximately

{{{TS =10.9}}}


then, the perimeter will be:

{{{P=12+5+10.9}}}

{{{P=27.9}}}