To find the total area of the three square plots, we first calculate the area of each individual square plot using the formula for the area of a square, which is:
\[ \text{Area} = \text{side length}^2 \]
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For the square plot with a side length of 4 feet: \[ \text{Area}_1 = 4^2 = 16 \text{ square feet} \]
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For the square plot with a side length of 3 feet: \[ \text{Area}_2 = 3^2 = 9 \text{ square feet} \]
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For the square plot with a side length of 2 feet: \[ \text{Area}_3 = 2^2 = 4 \text{ square feet} \]
Next, we add the areas of all three plots together to find the total area:
\[ \text{Total Area} = \text{Area}_1 + \text{Area}_2 + \text{Area}_3 \]
Substituting the areas we calculated:
\[ \text{Total Area} = 16 + 9 + 4 = 29 \text{ square feet} \]
Thus, the total area of the three plots is:
\[ \boxed{29} \text{ square feet} \]