As shown in the figure, the circumference of the bottom surface of a cylinder is 24cm, and the height AB is 4 cm.BC It's the diameter. An ant starts from point a and crawls along the surface of the cylinder to point C The shortest distance is about () A.4m B.13cm C.14cm D.16cm

It's the second day of junior high school
Unfold the side of the cylinder, the strand is half the circumference, and the hook is the height
According to Pythagorean theorem
AC square = AB square + (bottom perimeter / 2) square = 16 + (24 / 2) square = 160
AC ≈ 13 select b

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