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2. Surface (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Surface_(mathematics)

   A sphere is the surface of a solid ball, here having radius r. In mathematics, a surface is a mathematical model of the common concept of a surface.It is a generalization of a plane, but, unlike a plane, it may be curved; this is analogous to a curve generalizing a straight line.

3. Differential geometry of surfaces - Wikipedia

   en.wikipedia.org/wiki/Differential_geometry_of...

   A ruled surface is one which can be generated by the motion of a straight line in E 3. [46] Choosing a directrix on the surface, i.e. a smooth unit speed curve c(t) orthogonal to the straight lines, and then choosing u(t) to be unit vectors along the curve in the direction of the lines, the velocity vector v = c t and u satisfy

4. Boy's surface - Wikipedia

   en.wikipedia.org/wiki/Boy's_surface

   An animation of Boy's surface. In geometry, Boy's surface is an immersion of the real projective plane in three-dimensional space.It was discovered in 1901 by the German mathematician Werner Boy, who had been tasked by his doctoral thesis advisor David Hilbert to prove that the projective plane could not be immersed in three-dimensional space.

5. Worksheet - Wikipedia

   en.wikipedia.org/wiki/Worksheet

   They are used, to some degree, in most subjects, and have widespread use in the math curriculum where there are two major types. The first type of math worksheet contains a collection of similar math problems or exercises. These are intended to help a student become proficient in a particular mathematical skill that was taught to them in class.

6. Gesell Developmental Schedules - Wikipedia

   en.wikipedia.org/wiki/Gesell_Developmental_Schedules

   Accordingly, the scale would purportedly be able to show that infants and young children who demonstrate behaviors or responses more typical of an older chronological age would have higher intelligence. [1] Additionally, the Gesell Developmental Schedule has moved beyond merely identifying high-intelligence children and has become a research tool.

7. Kindergarten readiness - Wikipedia

   en.wikipedia.org/wiki/Kindergarten_readiness

   The Kindergarten Behavior and Academic Competency Scale (KBACS): The KBACS is a questionnaire that is completed by a child's teacher in order to assess the child's readiness for school. The teacher rates the child across a variety of domains such as following classroom rules, completing work, etc. using a 5-point scale (ranging from poor to ...