Question 831767
Check the area of both to compare.
The area of the rectangle is {{{A[R]=16*3=48}}}
Now check the area of the triangle you're trying to sew.
The area of an equilateral triangle (three equal sides) is,
{{{A[ET]=s^2(sqrt(3)/4)}}}
{{{A[ET]=8^2(sqrt(3)/4)}}}
{{{A[ET]=27.7}}}
Since you have 48 and you need 27.7, yes, you can make the triangle.