English

a small part of the whole _(takkur)
― the company runs a railway and a hotel chain, but they are just a small part of their businesses

Japanese

全体の中の、小さな部分 _(takkur)
― その会社は鉄道とホテルチェーンを運営しているが、それは彼らの事業の一角に過ぎない

_{takkur (2018-02-13 09:53:52)}

(TK Feb 13, 2018) singular only. you can't say "二角", "三角",...