Area of shapes

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Across
  1. 8. The longest side measurement.
  2. 10. To increase a number by another number.
  3. 12. A shape with equal opposite sides and 90-degree angles.
  4. 13. Trapezium: A trapezium with equal non-parallel sides.
  5. 14. The bottom side of a shape.
  6. 15. The perpendicular distance from the base to the top.
Down
  1. 1. A line connecting non-adjacent vertices.
  2. 2. The space inside a shape.
  3. 3. The side measurement from edge to edge.
  4. 4. A shape with parallel and equal opposite sides.
  5. 5. To find a numerical answer.
  6. 6. A mathematical rule.
  7. 7. A three-sided shape.
  8. 9. Height: Height measured at a right angle to the base.
  9. 11. A shape with one pair of parallel sides.