Question 1201705
One way to draw this is that the hypotenuse of the 30 30 90 triangle is one of the legs of the 45 45 90 triangle.  


The other leg of the 45 45 90 triangle is also 24 units, and the hypotenuse of this triangle is {{{24*sqrt(2)}}}.


You could use Pythagorean Theorem formula for the other special triangle's legs.  Recognize that the short leg is 12 units, hypotenuse is 24 (given), and.....
{{{12sqrt(3)}}}.