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As stated, the question cannot be answered. The pyramid could be irregular so that its triangular faces have different areas.

If it were a regular pyramid, then with a square base it has four triangular faces whose combined area is

189 - 49 = 140 cm2

So each triangular face has an area of 140/4 = 35 cm2

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Q: The surface area of a pyramid is 189 cm squared The area of the square base is 49 cm squared. What is the area of one triangular face of the lateral surface?
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