Surface area of any pyramid is 1/2Pl + B; where P=perimeter of the base, l=slant height and B= Area of the base.
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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 is the sum of the areas of its four faces.
the answer is 120
It will be: 4*30mm2 = 120mm2
4*50 = 200 cm2.