Across
- 5. A perfect round ball. A sphere is a closed solid bounded by a surface on which all points are equidistant from a central point called the center.
- 6. Planar figures or solid shapes that have the same shape and size.
- 9. Also called non-coplanar lines. They are straight lines that are neither parallel, nor intersecting. They lie in different planes.
- 10. A closed plane figure bounded by at least three line segments.
- 11. segment Part of a line between two points called endpoints.
- 12. 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.
- 15. The point on a line segment that divides the given line segment into two congruent parts.
- 16. The side opposite the right angle in a right triangle.
- 19. angles Two angles that share the same vertex and have one side in common between them.
- 21. Also called half-line. It is a straight line that extends from a point.
- 22. The boundary line of a circle or the length of such a boundary line.
- 23. A point at which the two rays of an angle meet or the intersection point of two sides of a plane figure. A point shared by three or more sides of a solid figure.
- 24. angle An angle with a measure between 0° and 90°.
- 26. Two lines that intersect at right angles.
- 28. Two angles that add up to 180°.
- 31. Flying mammal
- 32. The length of the boundary around a shape or a figure.
- 35. A space figure with two parallel polygonal bases that are the same shape and the same size.
- 36. Points or lines that all lie in the same plane.
- 37. A polyhedron whose one face is a polygon and the other faces are triangles with one common vertex.
- 38. Large marsupial
- 39. A point B that lies on the line connecting two points A and C and has one of the two points on each side of it. The point B is said to be between points A and C if, and only if, AB + BC = AC, in which AB is the distance from A to B, BC is the distance from B to C, and AC is the distance from A to C.
- 41. 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.
- 42. angles The pair of angles opposite each other formed by two intersecting lines.
- 45. polygon 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. The outside of a circle or an ellipse is the convex side; so is the outer surface of a sphere. coordinate 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.
- 46. Man's best friend
- 47. angle An angle that is between 90° and 180°.
- 48. Likes to chase mice
Down
- 1. A line segment that passes through the center of a circle and has its two endpoints on the circle. A line segment that passes through the center of a sphere and has its two endpoints on the surface of the sphere.
- 2. A can-shaped solid figure.
- 3. A unit of measure used to measure the magnitude of an angle, equal in magnitude to 1/360 of a complete revolution.
- 4. A straight line or a plane that divides a line, a plane, an angle, or a shape into two equal parts.
- 6. An additional geometric figure that is constructed to assist in solving a problem or producing a proof.
- 7. Lying on the same straight line.
- 8. rays Two things that are located or facing directly across. Two opposite numbers are the two numbers that are equidistant from the origin on a number line but in opposite directions from the origin.
- 13. 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. When at least one of the interior angles of a polygon is greater than 180°, it is a concave polygon. The inside surface of a bowl is concave when
- 14. pair A pair of adjacent angles formed by intersecting lines.
- 17. A planar surface of a solid figure.
- 18. The set of all the elements within a particular universal set that are not elements of the given set.
- 20. Often referred to as the right cone. A cone is a solid formed by rotating a right triangle around one of its legs.
- 25. A line segment where two faces of a polyhedron meet.
- 27. The distance from the center of a circle to any point on its circumference.
- 29. term A linear system of equations that has fewer equations than variables.
- 30. A statement accepted as true without proof. A postulate should be so simple and direct that it seems to be unquestionably true.
- 32. Two or more straight coplanar lines that do not intersect.
- 33. Has a trunk
- 34. The surface included within a closed figure, measured by the number of square units needed to cover the surface.
- 35. A set of logical arguments used to deduce or prove a mathematical theorem from a set of axioms.
- 37. A geometric object that has no dimension and is used to indicate a location.
- 40. 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.
- 43. angle 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.
- 44. The figure formed by two rays from the same initial point. The two rays are called the sides of the angle and the initial point is called the vertex of the angle. The symbol for angle is .