What are the three body parts that have a relationship between them?

Question

State a question regarding the relationship between them. and what experiment would you design to test your answer using a minimum of 10 subjects.

Answer 1

You aren't getting answers because we don't know if you are supposed to test a mathematical relationship, a physiological relationship, or some other relationship.

If you are looking for a mathematical relationship, try the length of the foot, the distance from the floor to the knee joint, and the distance from the knee joint to the hip joint. Is the ratio of these measurements the same in all people?

If you are looking for a physiological relationship, consider the forearm, the hand and the fingers. If you hold your hold loosely and let the fingers relax, watch what happens to the position of your thumb and your index finger when you straighten your wrist. With the forearm held upright (maybe with the elbow resting on a table) and the wrist relaxed, the hand is bent at nearly a right angle and the distance between the index finger and the thumb on that hand is maybe 4-5 cm.
Straighten the wrist so the hand is vertical, but keep the fingers relaxed. The distance between the index finger and the thumb is reduced to less than one cm.