Question 966925
You should make a drawing to more clearly understand.


Angle between long side and base side:
{{{23.73^2+16.38^2-2*(23.73)(16.38)cos(s)=16.33^2}}}----this is Law of Cosines.
{{{-2(23.73)(16.38)cos(s)=16.33^2-23.73^2-16.38^2}}}
{{{cos(s)=(16.33^2-23.73^2-16.38^2)/(-2(23.73)(16.38))}}}
{{{cos(s)=(23.73^2+16.38^2-16.33^2)/(2(23.73)(16.38))}}}
{{{cos(s)=564.7484/777.3948}}}
{{{cos(s)=0.7264628}}}
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Find the  SINE of s:
{{{sin^2(s)+cos^2(s)=1}}}
{{{sin^2(s)=1-cos^2(s)}}}
{{{sin(s)=sqrt(1-cos^2(s))}}}
{{{sin(s)=sqrt(1-(0.7264628)^2)}}}
{{{highlight_green(sin(s)=0.6872)}}}


Height from top of triangle to the base length 23.73 is this:
{{{16.38*sin(s)}}}
{{{highlight_green(16.38*(0.6872))}}}
{{{highlight(11.26)}}}