Answer:
280π units² or 879.645943 units²
Explanation:
Let's use the formula for the surface area of a cylinder: 2πrh + 2πr² (r=radius, h=height)
Let's plug in the numbers given now since we can assume h=13 (since side length and height can be the same) while r=10.
2π(13)(10) + 2π(10)²
2π(130) + 2π(10)
260π + 20π
280π units² or 879.645943 units²