Mathematics crossword

123456
Across
  1. 3. – A tool used to measure angles.
  2. 4. – A four-sided shape with opposite sides equal and four right angles.
  3. 6. – Two lines that never meet, no matter how far they extend.
Down
  1. 1. – A group of 12 things.
  2. 2. – A round shape with no corners or edges.
  3. 5. – A line from the center of a circle to its edge.