Terms for subject Mathematics containing a three

English	Russian
a square three centimeters on a side	квадрат со стороной 3 см
increase by a factor of three to five	увеличиваться от 3 до 5 раз
similarity of triangles means that the three angles in one triangle are equal to the three angles of another triangle and, as a consequence, the corresponding sides are in the same ratio	подобие треугольников
three-in-a-row	игра в крестики и нолики