"Radiuses" is a real, but less-common and less-accepted plural for radius. A quick search and check of references will confirm that. "1 - 10 of about 92,000 f

"Radiuses" is a real, but less-common and less-accepted plural for radius. A quick search and check of references will confirm that. "1 - 10 of about 92,000 for radiuses." "Results 1 - 10 of about 5,700,000 for radii [definition]."