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If its a triangular based pyramid (tetrahedron) then it will have 4 equilateral triangle faces and so find the area of one face and multiply it by 4 to give the total surface area.
It depends on whether or not the tetrahedron is regular. There is nothing in the question to indicate that it might be regular. In that case the easiest way to calculate the surface area is to sum the areas of each of its 4 faces.
Total surface area = (2*pi*radius2)+(diameter*pi*height)
Total surface area = (2*pi*r2)+(pi*r2) Area = 300*pi in square units
Total surface area = (2*pi*r2)+(2*pi*r*height) Surface area = 69.11503838 or 69 square units