A cylinder with a bottom diameter of 10 cm and a height of 15 cm is cut into two half cylinders along the diameter. What is the surface area of one half cylinder? fast

The surface area of two half cylinders is two more diameter surfaces than that of the original, so there are two circular surfaces, one large side surface and two section surfaces
Area s = π * R ^ 2 * 2 + π d * H + D * h * 2
=50π+150π+300
=200π+300

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