Shapes

12345678
Across
  1. 3. Three sides
  2. 4. Four sides are all equal each other and the angles are all 90°
  3. 6. Two sides parallel
  4. 7. Four sides
Down
  1. 1. The bottom of the cone
  2. 2. It is a simple (non self intersecting) quadrangle with two pairs of parallel edges
  3. 5. The four corners are angled parallelogram
  4. 8. A quadrangle equal on all sides