Which is the correct relation of radius and diameter?
r = 2D
D = 2r
r = D
r = 3D
Diameter = 2 × radius (or) twice the radius ∴ D = 2r is the correct relation between them.
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