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Question 1: The ________ can be computed using Brahmagupta's formula for a cyclic quadrilateral, or Bretschneider's formula for a general quadrilateral.
PolygonAreaTriangleSphere

Question 3: (It is common, especially in the discussions on plane ________, to refer to the concave quadrilateral with these properties as a dart or arrowhead, with term kite being restricted to the convex shape.)
CubeTetrahedronPolyhedronTessellation

Question 4: Trapezium (________) or trapezoid (NAm.): one pair of opposite sides are parallel.

Question 5: Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5-sided), ________ (6-sided) and so on.
Regular polygonHexagonPolygonOctagon

Question 6: In geometry, a quadrilateral is a ________ with four sides (or 'edges') and four vertices or corners.
PolyhedronPolytopeRegular polytopePolygon

Question 7: The interior angles of a quadrilateral add up to 360 ________.
Metric systemLongitudeLatitudeDegree (angle)