Tan, Christine What is a triangle? / Christine Tan - 2nd ed. - Petaling Jaya : Alpha Sigma, 2006 - 14p. : col. ill. ; 27cm. ISBN: 9830560902 : RM30.00 9789830560908 Nat. Bib. No.: M07-04210 Subjects--Topical Terms: Shapes--Juvenile literatureTriangle--Juvenile literature Dewey Class. No.: 516.154