App description

<img src="http://drr.ikcest.org/static/upload/df/df4cf9d6-e974-11e9-ae4c-00163e0618d6_m.jpg" />

Volume formula of hollow cylinder:

The volume of hollow cylinder v = h × 3.14 × (r2-r2)

H - height, R - radius of outer circle, R - radius of inner hole

Usage example

Outer radius (RO): 8

Internal radius (RI): 5

Height (H): 4

Click "calculate" to output the result

Volume: 490.08845396004

Results: 490.08845396004