A = \pi r^2 + \pi r l
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- Problem 3:
- A cone has a base radius of 5 cm and a slant height of 13 cm. What is the total surface area of the cone? (Use \(\pi \approx 3.14\))
- The total surface area \(A\) of a cone is the sum of the base area and the lateral surface area:
- \(r = 5\) cm (radius),
- \(l = 13\) cm (slant height),
- \(\pi \approx 3.14\)
