A circle is an example of which dimensional figure?
Which of the following series forms an AP?
(i)a–2d,a–d,a,a+d,a+2d
(ii)a,a+d,a+2d,a+3d,a+4d
(iii)a–3d,a–d,a+d,a+3d
Shadow is 2d or 3d ? Explain.