Radius Post author By Rik D. Tangerman Post date November 20, 2020 No Comments on Radius The radius of a circle or a sphere is the distance of its centre to its perimeter. ← Altitude → Parallelogram Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment * Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Δ Optionally add an image (JPEG only)