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  2. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    Ring sizes can be measured physically by a paper, plastic, or metal ring sizer (as a gauge) or by measuring the inner diameter of a ring that already fits. Ring sticks are tools used to measure the inner size of a ring, and are typically made from plastic, delrin , wood, aluminium, or of multiple materials.

  3. Building blocks (toy) - Wikipedia

    en.wikipedia.org/wiki/Building_blocks_(toy)

    The system consisted of brown rubber blocks with a basic grid size of 1 by 12 by 3 ⁄ 8 inch (25 mm × 13 mm × 9.5 mm). [17] Beginning in 1939, Halsam Products manufactured its American Bricks from pressed wood. [18] "ELGO Plastics, Inc. was established as a division of Halsam Products Company in 1941."

  4. Pattern Blocks - Wikipedia

    en.wikipedia.org/wiki/Pattern_blocks

    Christopher Danielson developed a new set of blocks, called Twenty-First Century Pattern Blocks. [8] The rhombus in this set has the same size as the blue rhombus in the traditional set. The dart and the 30°–60°–90° triangle have the same area, while the kite and the hexagon are twice that area. Like the traditional set, all the angles ...

  5. Sliding puzzle - Wikipedia

    en.wikipedia.org/wiki/Sliding_puzzle

    A sliding puzzle, sliding block puzzle, or sliding tile puzzle is a combination puzzle that challenges a player to slide (frequently flat) pieces along certain routes (usually on a board) to establish a certain end-configuration. The pieces to be moved may consist of simple shapes, or they may be imprinted with colours, patterns, sections of a ...

  6. Manipulative (mathematics education) - Wikipedia

    en.wikipedia.org/wiki/Manipulative_(mathematics...

    One of the ways of making a dodecagon with pattern blocks. Pattern blocks consist of various wooden shapes (green triangles, red trapezoids, yellow hexagons, orange squares, tan (long) rhombi, and blue (wide) rhombi) that are sized in such a way that students will be able to see relationships among shapes. For example, three green triangles ...

  7. Stickle Bricks - Wikipedia

    en.wikipedia.org/wiki/Stickle_bricks

    An individual stickle brick is a colourful plastic shape a few centimeters long which has a "brush" of small plastic "fingers" on one or more surfaces. The fingers of adjacent stickle bricks can interlock, allowing them to be joined in various ways.

  8. Unit block - Wikipedia

    en.wikipedia.org/wiki/Unit_block

    Pratt based her blocks on a similar but larger-scale block system designed by educator Patty Hill, a follower of Friedrich Fröbel, the originator of kindergarten education. Fröbel's series of 20 age-calibrated educational "gifts" had included a set of eight blocks, sized ½ by 1 by 2 inches, or a 1:2:4 ratio, which could be formed into a cube ...

  9. Comb binding - Wikipedia

    en.wikipedia.org/wiki/Comb_binding

    Then the user chooses a spine size that will match the document. Standard sizes are 4.8 mm ( 3 ⁄ 16 in) (for 16 sheets of 20# paper) up to 51 mm (2 in) (for 425 sheets). Spine lengths are generally 280 mm (11 in) to match the length of letter-size paper.

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