math crossword - Kevin Lee

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Across
  1. 3. a ___ of a circle or sphere is any of the line segments from its center to its perimeter. It is half of the circle.
  2. 6. is a branch of mathematics that studies relationships between side lengths and angles of triangles. IT helps us find angles and distances, and is used a lot in science, engineering, video games, and more.
  3. 9. the traditional name for the geometry of three-dimensional Euclidean space. This includes including pyramids, prisms and other polyhedrons; cylinders; cones; truncated cones; and balls bounded by spheres.
  4. 10. is the distance measured along a lateral face from the base to the apex along the "center" of the face. In other words, it is the altitude of the triangle comprising a lateral face.
  5. 11. the space occupied by a flat shape or the surface of an object. measured in square units such as square centimeters, square feet, square inches, etc.
  6. 13. is a connected subset of a differentiable curve. it is also called segments or rays, depending on whether they are bounded or not.
  7. 16. a triangle that has two sides of equal length. Sometimes it is specified as having exactly two sides of equal length.
  8. 18. is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance or shape occupies or contains.
  9. 19. is a particular type of line segment joining two vertices in a polygon, polyhedron, or higher-dimensional polytope. It is a line segment on the boundary, and is often called a side.
Down
  1. 1. one of the most basic of curvilinear geometric shapes. It is the idealized version of a solid physical tin can having lids on top and bottom.
  2. 2. a part of a circle made of the arc of the circle along with its two radii. It is a portion of the circle formed by a portion of the circumference (arc) and radii of the circle at both endpoints of the arc.
  3. 4. is the sum of the areas of all faces on a 3D shape. It is the measure of the total area that the surface of the object occupies.
  4. 5. A solid object where: The sides are triangles which meet at the top.
  5. 7. angles that are opposite to each other when two lines cross. It is also known as vertical angles.
  6. 8. is a numerical measurement of how far apart objects or points are. may refer to a physical length or an estimation based on other criteria.
  7. 12. is a transparent optical element with flat, polished surfaces that refract light. At least one surface must be angled.
  8. 14. a simple quadrilateral with two pairs of parallel sides. The opposite or facing sides are equal in length.
  9. 15. the measurement from base to top. It is measured in cm, inches, meters, etc.
  10. 17. a three-dimensional shape that's half of a sphere with one flat, circular side.
  11. 18. often denoted by letters such as, is a point where two or more curves, lines, or edges meet. As a consequence of this definition, the point where two lines meet to form an angle and the corners of polygons and polyhedra are vertices.