Central angle intersection points and of the legs of the angle with the circle form a diameter, then is a straight angle. (In radians, .) Let be the minor arc of the circle between points and , and let be the radius of the circle. If the central angle is subtended by , then If the central angle is not subtended by the minor arc , then is a reflex angle and If a tangent at and a tangent at intersect at the exterior point , then denoting the center as , the angles (convex) and are supplementary (sum to 180°). A
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