| 1. | They are in the plane of symmetry of the whole figure.
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| 2. | They are zygomorphic, having only one vertical plane of symmetry.
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| 3. | Isotropic materials have an infinite number of planes of symmetry.
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| 4. | Species in this genus have four longitudinal planes of symmetry.
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| 5. | Enantiotopic groups are mirror images of each other about an internal plane of symmetry.
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| 6. | Just as nodes at the plane of symmetry must likewise be zero in this case.
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| 7. | Pitch is about an axis perpendicular to the longitudinal plane of symmetry, positive nose up.
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| 8. | Flowers can have either one or many planes of symmetry; that is either zygomorphic or actinomorphic.
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| 9. | It can be proved that a material having two planes of symmetry must have a third one.
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| 10. | A cross-capped disk has a plane of symmetry which passes through its line segment of double points.
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