To determine which figure is similar to Figure 1, we need to look for triangles that share the same shape characteristics (angles) and side ratios, regardless of size.
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Figure 1 is described as an obtuse triangle with its base extending from columns 4 to 5 and a height of 3 units down from column 4.
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Figure 2 is an isosceles triangle, which does not match the obtuse nature of Figure 1.
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Figure 3 is an inverted obtuse triangle, which may have similar properties (being obtuse), and is likely to have angle ratios that correspond to those in Figure 1, given the vague description provided.
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Figure 4 does not match the characteristics either since the base and height dynamics differ.
Based on these observations, Figure 3 is the likely candidate for similarity due to its obtuse nature. Thus, the answer is:
Figure 3 is similar to Figure 1.