Lami's theorem. (mechanics). When three forces act on a particle in equilibrium, the magnitude of each is proportional to the sine of the angle between the other two. 1  Facebook.
Variable reactions: Brown recluse spider's bite can cause no reaction, a mild reaction, an immediate or a delayed reaction. With a significant reaction a which blister appears after bit. The surrounding skin becomes hard, swollen & can be red, white & blue. A deep lesion can develop which can eat through fat and muscle.
Be cautious of both black widow spiders and brown recluse spiders if bitten. Both can cause painful bites, which can be deadly in some cases. The brown recluse spider bite can cause severe blistering, blue discoloration, and necrotic lesions with scarring.