Surface area of a frustum of a cone

Geometry Level 3

Shown in the above figure is a frustum of a right circular cone. The upper base has a radius of 3 centimeters and the lower base has a radius of 6 centimeters. If the height is 12 centimeters, what is the surface area in square centimeters?

9 π + 36 π + 9 153 9\pi +36\pi +9 \sqrt{153} 45 π + 9 153 π 45\pi+9\sqrt{153}\pi 9 π 153 9\pi \sqrt{153} 18 π 153 + 45 π 18\pi \sqrt{153}+45\pi

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