Sudut
Lima unit tentang sudut: mengukurnya dengan busur derajat, menamai jenis-jenisnya, pasangan sudut yang berjumlah 90° dan 180°, delapan sudut yang terbentuk ketika sebuah garis memotong dua garis sejajar, serta jumlah sudut segitiga dan segi banyak. Lab trigonometri di setiap halaman berisi busur derajat, sepasang garis sejajar, dan segitiga yang titik sudutnya bisa kamu seret.
Progres
- 1Mengukur sudut dengan busur derajat
- 2Sudut lancip, siku-siku, tumpul, dan refleks
- 3Sudut berpenyiku, berpelurus, dan bertolak belakang
- 4Garis sejajar dan garis transversal
- 5Jumlah sudut segitiga dan segi banyak
Sumber kursus ini (5)
- OpenStax, Contemporary Mathematics : 10.2 Angles (angle = two rays with a common endpoint, the vertex; naming ∠ABC and m∡; protractor use, centre mark on the vertex; acute < 90°, right 90°, obtuse between 90° and 180°, straight 180°; adjacent, supplementary (sum 180°), complementary (sum 90°), vertical angles equal; a transversal of two parallel lines makes eight angles numbered 1 to 8, alternate interior 3 and 6, 4 and 5, alternate exterior 2 and 7, 1 and 8, corresponding 1 and 5, 3 and 7, 2 and 6, 4 and 8: openstax.org/books/contemporary-mathematics/pages/10-2-angles)
- 10.3 Triangles (interior angles add to 180°; Thales is credited with the equal base angles of an isosceles triangle and with vertical angles being equal: .../pages/10-3-triangles)
- 10.4 Polygons, Perimeter, and Circumference (interior angle sum S = (n − 2)180°, heptagon 900°: .../pages/10-4-polygons-perimeter-and-circumference)
- OpenStax Precalculus 2e 5.1 Angles (one degree is 1/360 of a full rotation; radian: openstax.org/books/precalculus-2e/pages/5-1-angles)
- MacTutor History of Mathematics, University of St Andrews, "The trigonometric functions" (Ptolemy divides the circle into 360° showing Babylonian influence; 30′ is half of 1°: mathshistory.st-andrews.ac.uk/HistTopics/Trigonometric_functions/)
Diperiksa: 2026-10-17