tangiad

== Welsh == === Etymology === Adapted from English tangent + -iad. === Noun === tangiad m (plural tangiadau) (mathematics, differential geometry) tangent Synonym: (obsolete) cyffyrddlin ==== Related terms ==== trigonometreg (“trigonometry”) sin (“sine”) cosin (“cosine”) === References === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “tangiad”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies