Angle ∠BAC might refer to any of four angles: the clockwise angle from B to C, the anticlockwise angle from B to C, the clockwise angle from C to B, or the anticlockwise angle from C to B, where the direction in which the angle is measured determines its sign (see Positive and negative angles). However, in many geometrical situations it is obvious from context that the positive angle less than or equal to 180 degrees is meant, and no ambiguity arises. Otherwise, a convention may be adopted so that ∠BAC always refers to the anticlockwise (positive) angle from B to
Mathematics education in Australia degrees. The course is divided into four (4) semesters. The areas learned are in the following: Semester 1 (Year 11/Form 5): Semester 2 (Year 11/Form 5): Semester 3 (Year 12/Form 6): Semester 4 (Year 12/Form 6): Since 2010, the Year 11 and 12 mathematics courses of study were: Mathematics courses 1A/1B and 1C/1D are non-ATAR subjects. However, new WACE mathematics courses are to be introduced for Year 11 students in 2015 and Year 12 students in 2016 in order to align with the Australian curriculum in Western Australia. The new WACE mathematics courses consist of four units. Each unit is