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