To find surface area of 3D objects, you have to know the area formulas for basic shapes. For example, the area of a circle is

and the area of a rectangle is length times width. To find surface area of a cylinder, you will need to know both of those formulas, since the 3D shape involves both circles and rectangles.
240is the answer for the question 16
Answer:
what am I suppose to answer
Answer:
i think its b
Step-by-step explanation:
because you have to add or subtract on both sides