11. Bracts, usually broader than leaves and larger than the flowers, subtend each flower. 12. A small object nearby may subtend the same solid angle as a larger object farther away. 13. The larger the angle an object subtends , the larger the apparent size of the object. 14. The bracts which subtend the flowers are more or less the same length as the calyx. 15. Two objects with different actual size have the same apparent size when they subtend the same angle. 16. This implies that, seen from any point on its directrix, any parabola subtends a right angle. 17. It can be useful to compare it with the length of the analemma, which subtends 47 degrees. 18. They subtend 0.1 0.3?along the ring, which correspond to 1000 3000 km. 19. The yellowish-green bracts which subtend the flowers are very short, only 5 15 mm long. 20. The pale green bracts which subtend the flowers are more or less the same length as the calyx.
