Volume and Quadrilaterals.

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Across
  1. 4. A quadrilateral which has both pairs of opposite sides parallel.
  2. 7. A quadrilateral with four equal sides and angles equal to 90°
  3. 8. A closed plane figure having all points an equal distance from the center.
  4. 9. Lines that share a common point are ___ lines.
  5. 11. ABCD is a rhombus. Diagonal AC is equal to one of its sides. Then ∆ABC must be
  6. 14. Which figure is obtained by joining 3 collinear points in pairs?
Down
  1. 1. A line through the mid-point of a side of a triangle parallel to another side bisects the third side. Which theorem?
  2. 2. Figures that have the same size and shape are
  3. 3. ⅔πr³ is the Volume of
  4. 5. A part of a line that has one endpoint and goes on forever in one direction
  5. 6. All the angles of a convex quadrilateral are congruent. However not all its sides are congruent. What type of quadrilateral is it?
  6. 10. A parallelogram in which any pair of adjacent sides is equal
  7. 12. A subset of a line which contains two endpoints
  8. 13. The sum of three angles of a quadrilateral is 3 right angles. Then the fourth angle is a/an