Video narration
Doraemon ar Nobita hate dhora ekti tiner caner dike takiye ache. Can-tir operer ar nichher mukh, dutoi saman gol. Tader majher soja lomba duratto holo height, ar gol mukher kendra theke kinara porjonto duratto holo radius. Tai can-ti shudhu ekti gol dag noy; eti ekti trimatrik right circular cylinder. Ebar can-er bhitorer jayga, orthat volume, ber korte radius-ke nijer songe gun kore height diye gun koro: V = pir^2h. Mone rekho: dui saman gol base, height, ar ei formula.