Determine whether the forces in the pair are pulling at right angles to each other.

for each group of three forces below, determine whether the forces in each pair are pulling at right angles to each other.

12 lb, 13 lb, resultant force 19 lb yes; 15 lb, 36 lb, resultant force 39 lb yes

12 lb, 13 lb, resultant force 19 lb yes; 15 lb, 36 lb, resultant force 39 lb no

12 lb, 13 lb, resultant force 19 lb no; 15 lb, 36 lb, resultant force 39 lb no

12 lb, 13 lb, resultant force 19 lb no; 15 lb, 36 lb, resultant force 39 lb yes