geometry

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Across
  1. 3. angle sum is 360 in polygons
  2. 5. equals(a+c)/2 if the diagonals are perpendicular in isoseceles trapezoid
  3. 6. of isoseceles trapezoid are equal
  4. 7. each interior angle is 120
Down
  1. 1. diagonals are in right trapezoid h^2=a.c
  2. 2. has eaqual diagonals
  3. 4. of trapezoid are parallel