DNA origami has been around since $2006.$ Complex shapes are built by leveraging the bond specificity between DNA base pairs. Three$-$dimensional shapes have now been built by using other materials to facilitate assembly such as inorganic nanoparticles or proteins. The example below is a $3$D hollow truss structure composed of equilateral triangles $[1].$ Use the method of joints to determine all loads in the $2$D DNA nanotruss composed of equilateral triangles $(25$ bp per side$).$ Label whether the members are in tension or compression. Assume the DNA truss is covalently linked to a SiO$2$ bead at A and also rests on a fluorinated gold nanoparticle at C$.$ Model the covalent bond as a hinge and the nanoparticle support as a roller. Also, treat the DNA strands as rigid truss members.