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If the question is asking square meters, then it refers to the area. And since it mentions radius, it is considered a circle, and so, in finding the area of a circle, we use the formula:  \pi  r^{2} ,Where A is the area,  \pi is the constant 3.14 and is the radius. Therefore:

Area= 3.14 (135)²
        = 3.14 (18225)
        = 57226.5km²
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Simple, we just have to find it's area.
A = πr²
A = 3.14(135 km)²
A = 3.14(18 225 km²)
A = 57 226.5 km²

Therefore, the answer to your question is 57 226.5 km²
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