Geometry

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Across
  1. 3. — the distance around a circle
  2. 5. — a triangle with two equal sides
  3. 6. — shapes that are identical in size and form
  4. 8. — when one half mirrors the other
  5. 11. — a polygon with four sides
  6. 12. — the longest side of a right triangle
  7. 14. — the point where two lines or edges meet
  8. 15. plane — a grid defined by an x‑axis and y‑axis
Down
  1. 1. — lines that meet at a right angle
  2. 2. angle — an angle measuring less than 90 degrees
  3. 4. — a line passing through the center of a circle, touching both sides
  4. 7. — distance from the center of a circle to any point on it
  5. 9. angle — an angle greater than 90 degrees but less than 180
  6. 10. lines — lines that never intersect
  7. 13. — a closed shape with straight sides