Across
- 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.
- 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.
- 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.
- 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.
- 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.
- 13. is a connected subset of a differentiable curve. it is also called segments or rays, depending on whether they are bounded or not.
- 16. a triangle that has two sides of equal length. Sometimes it is specified as having exactly two sides of equal length.
- 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.
- 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. 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. 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.
- 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.
- 5. A solid object where: The sides are triangles which meet at the top.
- 7. angles that are opposite to each other when two lines cross. It is also known as vertical angles.
- 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.
- 12. is a transparent optical element with flat, polished surfaces that refract light. At least one surface must be angled.
- 14. a simple quadrilateral with two pairs of parallel sides. The opposite or facing sides are equal in length.
- 15. the measurement from base to top. It is measured in cm, inches, meters, etc.
- 17. a three-dimensional shape that's half of a sphere with one flat, circular side.
- 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.