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It's the same as a rectangle with a lenght of 12pi and a width of 13 cm.

Therefore it equals to 12x13pi = 452 squared cm But btw, that is not possible since the diametre is greater than the slant... It can't be a cone.

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Q: What is the lateral area of a right cone with the diameter of 13cm. and slant height of 12cm.?
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