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For example, older children may choose to climb on the outside of a "safe" but boring play structure, rather than using it the way the designers intended. Similarly, rather than letting young children play on playground slides by themselves, some injury-averse parents seat the children on the adult's lap and go down the slide together. [29]
The apparent triangles formed from the figures are 13 units wide and 5 units tall, so it appears that the area should be S = 13×5 / 2 = 32.5 units. However, the blue triangle has a ratio of 5:2 (=2.5), while the red triangle has the ratio 8:3 (≈2.667), so the apparent combined hypotenuse in each figure is actually bent.
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Among other things, they allow children to see how shapes can be composed and decomposed into other shapes, and introduce children to ideas of tilings. Pattern blocks sets are multiple copies of just six shapes: Equilateral triangle (Green) 60° rhombus (2 triangles) (Blue) that can be matched with two of the green triangles
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A variation on the Penrose triangle, it is a two-dimensional depiction of a staircase in which the stairs make four 90-degree turns as they ascend or descend yet form a continuous loop, so that a person could climb them forever and never get any higher.
A toddler's first word often occurs around 12 months, but this is only an average. [23] The child will then continue to steadily add to his or her vocabulary until around the age of 18 months when language increases rapidly. He or she may learn as many as 7–9 new words a day. Around this time, toddlers generally know about 50 words.