Measurement!

123456789101112131415
Across
  1. 2. Longest side of a triangle
  2. 6. One thousand metres
  3. 7. A slice of a circle
  4. 9. There are 10 of these in a centimetre
  5. 10. A 3D shape with two opposite ends the same
  6. 13. The perimeter of a circle
  7. 15. Looks like a prism with a circular end
Down
  1. 1. The sum of the faces of a 3D shape
  2. 3. half x base x height equals this area
  3. 4. Measured in square units
  4. 5. Quadrilateral with one set of parallel sides
  5. 8. The distance around the outside of a shape
  6. 11. A quadrilateral with four equal sides
  7. 12. When you unfold a 3D shape you get this
  8. 14. Half the diameter