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OpenStudy (anonymous):
The surface area of this pyramid is 189cm^2 The area of the square base is 49cm ^2. What is the area of one triangular face of the lateral surface? Show the steps of your solution and explain your work.
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OpenStudy (dumbcow):
189-49 = 140 this is sum of all 4 triangular faces thus one would be 1/4 of 140 140/4 = 35
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