The surface area of a square pyramid depends on the lengths of the sides of the square base and of the vertical height. While the question does give two linear measures, it does not say which is which! And without that crucial bit of information, I cannot provide a more useful answer.
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Oh, what a happy little question! To find the area of a square, you simply multiply the length of one side by itself. In this case, with each side being 6cm long, you would multiply 6cm by 6cm to get an area of 36 square centimeters. Isn't that just delightful?
Surface area = pi*4*6 = 75.398 square cm
The surface area of a cylinder with a radius of 6cm and a height of 9cm is 565.5 units2
36 square cm
Surface area = (2*pi*32) + (pi*6*9)) = 72*pi which is about 226 square cm