Across
- 1. A planar surface of a solid figure.
- 4. A closed plane figure bounded by at least three line segments.
- 7. Also called non-coplanar lines. They are straight lines that are neither parallel, nor intersecting. They lie in different planes.
- 8. The two supplementary adjacent angles formed by two intersecting lines
- 11. The point on a line segment that divides the given line segment into two congruent parts.
- 13. The boundary line of a circle or the length of such a boundary line.
- 15. A solid bounded by at least four polygonal faces. The pairs of faces meet along their edges. Three or more edges meet in each vertex. A diagonal of a polyhedron is a line segment joining two vertices that are not in the same face.
- 17. The pair of angles opposite each other formed by two intersecting lines.
- 24. In geometry, a pair of angles is said to be vertical (also opposite and vertically opposite, which is abbreviated as vert. opp. ∠s) if the angles are formed from two intersecting lines and the angles are not adjacent.
- 26. A pair of angles that add up to 90°.
- 30. polygon Intuitively speaking, curved away from the eye. A concave figure is a set of points some of whose chords include points that are in the set.
- 32. rays two rays with a common endpoint that form a line
- 34. Two angles that add up to 180°.
- 36. A line segment that passes through the center of a circle and has its two endpoints on the circle. It also represents the length of such a line segment.
- 37. outside of a circle or an ellipse is the convex side; so is the outer surface of a sphere.
- 38. A pair of numbers that describe the position of a point on a coordinate plane by using the horizontal and vertical distances from the two reference axes.
- 40. An angle that is between 90° and 180°.
- 42. The figure formed by two rays from the same initial point.
- 43. A set of logical arguments used to deduce or prove a mathematical theorem from a set of axioms.
- 44. side by side and having the same distance continuously between them.
- 45. The distance from the center of a circle to any point on its circumference.
- 46. A line segment where two faces of a polyhedron meet.
Down
- 2. Often referred to as the right cone.
- 3. A polyhedron whose one face is a polygon and the other faces are triangles with one common vertex.
- 4. The length of the boundary around a shape or a figure.
- 5. Points or lines that all lie in the same plane.
- 6. Lying on the same straight line.
- 8. Part of a line between two points called endpoints.
- 9. suggest or assume the existence, fact, or truth of (something) as a basis for reasoning, discussion, or belief.
- 10. In mathematics, logic, and formal systems, a primitive notion is an undefined concept. In particular, a primitive notion is not defined in terms of previously defined concepts, but is only motivated informally, usually by an appeal to intuition and everyday experience.
- 12. The path of a point moving in opposite directions infinitely.
- 14. Planar figures or solid shapes that have the same shape and size.
- 15. In geometry, two lines or planes (or a line and a plane), are considered perpendicular (or orthogonal) to each other if they form congruent adjacent angles (a T-shape).
- 16. A can-shaped solid figure.
- 18. Two angles that share the same vertex and have one side in common between them.
- 19. A geometric object that has no dimension and is used to indicate a location.
- 20. Intuitively speaking, curved outward or toward the eye. A convex curve is a set of points any of whose chords do not include any point that is not in the set.
- 21. An additional geometric figure that is constructed to assist in solving a problem or producing a proof.
- 22. A straight line or a plane that divides a line, a plane, an angle, or a shape into two equal parts.
- 23. A flat surface that can extend forever in length and width but has no thickness. The surface of a calm sea and a flat valley are all physical models of a plane.
- 25. The side opposite the right angle in a right triangle.
- 27. An angle with a measure between 0° and 90°.
- 28. Having one thing on either side of it.
- 29. Also called half-line. It is a straight line that extends from a point.
- 31. A point at which the two rays of an angle meet or the intersection point of two sides of a plane figure.
- 33. A perfect round ball.
- 35. An angle that measures 90° or /2 radians. It is the angle between two perpendicular lines such as the corner of a square or two perpendicular planes such as the wall and the ground.
- 36. A unit of measure used to measure the magnitude of an angle, equal in magnitude to 1/360 of a complete revolution.
- 39. The surface included within a closed figure, measured by the number of square units needed to cover the surface.
- 41. A general conclusion proposed to be proved upon the basis of certain given hypotheses or assumptions; or, a general conclusion that has been proved, e.g., Pythagorean Theorem, Binomial Theorem, Fundamental Theorem of Algebra, etc.
- 44. a solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.