Vocabulary consisting only from characters you are able to read
角形
kakukei
(1)(N)-cornered polygon, incl. triangle, (2)Japanese rectangular envelope (opening on the short dimension; numbered 0-8, A3, A4, each with different sizes); mix
分の
bunno
denominator bun no numerator (in writing common fractions), X Yth's (Y bun no X)jlpt3, math