Let 10 vertical poles standing at equal distances on a straight line, substend the same angle of elevation alpha at a point O on this line and all the poles are on the same side of O. If the height of the longest pole is 'h' and the distance of he foot of the smallest pole from O is 'a', then the distance between two consecutive poles is

Let 10 vertical poles standing at equal distances on a straight line,

1.	Let 10 vertical poles standing at equal distances on a straight line, substend the same angle of elevation alpha at a point O on this line and all the poles are on the same side of O. If the height of the longest pole is 'h' and the distance of he foot of the smallest pole from O is 'a', then the distance between two consecutive poles is
Answer» `(hsinalpha+acosalpha)/(9sinalpha)` `(hcosalpha-asinalpha)/(9cosalpha)` `(hcosalpha-asinalpha)/(9sinalpha)` `(hsinalpha+acosalpha)/(9cosalpha)` ANSWER :C