Question 102261
0.5*a*b=A a=altitude b=base=48' A=area
0.5a*48=768 
a=768/24=32' divide each side by 24.
{{{(1/16)/12=b/576}}} Proportion for 1/16" : 12" 
{{{((1/16)*576)/12=b}}}
b=3" 
{{{(1/16)/12=a/384}}}
{{{((1/16)*384)/12=a}}}
a=2"
A=.5*3*2= 3 sq inches (Ans.)
Ed