Geometry symbols

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Across
  1. 3. When two shapes have the same shape but different sizes.
  2. 5. Lines that never meet, no matter how far extended.
  3. 6. A unit for measuring angles
  4. 7. A three-sided polygon
  5. 8. Two rays diverging from a common point
Down
  1. 1. The length between two points
  2. 2. A number greater than one with no positive divisors other than one and itself
  3. 4. Abbreviation for the unit of angle measure, also known as rad