Segments, triangles, planes, rays, and measuring angles.
The by T.M. Erina is a widely used educational supplement designed to align with major Russian 5th-grade mathematics textbooks, most notably the curriculum by N.Ya. Vilenkin and S.M. Nikolsky . Key Features of the Workbook matematika 5 klass rabochaia tetrad t.m erina reshebnik
Notation, addition, subtraction, multiplication, and division. Segments, triangles, planes, rays, and measuring angles