Which natural logarithm has the highest value among f(x) = log x and f(x) = ln x?
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What is the condition for the signs of equality for triangles?
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Find the slant height 'l' of a cone with radius 'r' and height 'h' using Pythagorean Theorem. Then, apply the formula for the lateral surface area 'A' of the cone: A = πr*l.