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3. Coins are placed around the perimeter of an equilateral triangle. If ten
coins are placed in one side, how many coins are placed around the
perimeter in total?
4. The following figure is made by stacking cubes. How many cubes are
there that cannot be seen in the picture?
3. Coins are placed around the perimeter of an equilateral triangle. If ten
coins are placed in one side, how many coins are placed around the
perimeter in total?
4. The following figure is made by stacking cubes. How many cubes are
there that cannot be seen in the picture?
