The length of a curved line is measured using a thread or a divider. Take a long thread. Let one end of the thread be placed at one end of the branch of the plant. Run the thread at straight distances on the branch from A to B, then from B to C and so on till the length of thread runs on full length of the branch. Shifting your hand from the previous to the next position, mark on the thread when it reaches the end of the branch. The length of the thread you have run is equal to length of the branch.
Place this thread on the scale with its one end at ‘0’. Take the reading on the other end. You will get the length of the curved branch of the plant.
