In case of U channel/ section, the length of travel of the edge of the strip (effective length of the strip) s , travelling in a helical pattern having initial length l is given by_____

In case of U channel/ section, the length of travel of the edge of t

1.	In case of U channel/ section, the length of travel of the edge of the strip (effective length of the strip) s , travelling in a helical pattern having initial length l is given by_____
A.	l<sup>2</sup> = s<sup>2</sup> + c<sup>2</sup>
B.	c<sup>2</sup> = l<sup>2</sup> + s<sup>2</sup>
C.	s<sup>2</sup> = l<sup>2</sup> + c<sup>2</sup>
D.	s = l<sup>2</sup> + c<sup>2</sup>
Answer» D. s = l<sup>2</sup> + c<sup>2</sup>