Angle pairs and quadrilaterals

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Across
  1. 2. A quadrilateral with four equal sides.
  2. 4. A quadrilateral with one pair of parallel sides.
  3. 5. Two angles whose sum is 90°.
  4. 7. Opposite angles formed by intersecting lines.
  5. 8. A quadrilateral with four right angles.
Down
  1. 1. Two angles whose sum is 180°.
  2. 3. A quadrilateral with four equal sides and four right angles.
  3. 6. Angles that share a common side and vertex.