Geometry

2. any parallelogram with equal sides, including a square
3. the part of a straight line considered as originating at a point on the line and as extending in one direction from that point
6. the intersection point of two sides of a plane figure
8. a quadrilateral having both pairs of opposite sides parallel to each other
10. a continuous extent of length
11. a position in space

1. a polygon with four sides
2. a straight line extending from the center of a circle or sphere to the circumference or surface
4. a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end
5. a triangle that has two sides of equal length
7. a quadrilateral plane figure having two parallel and two nonparallel sides
9. a triangle having three unequal sides and angles