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23 March, 01:49

What is the surface area of a triangular pyramid if each face has an area of 30 mm2? A. 60 mm2 B. 90 mm2 C. 160 mm2 D. 120 mm2

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  1. 23 March, 03:46
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    The number of lateral faces in a pyramid is going to be equal to the number of sides on the base. Since it is a triangular pyramid, there will be 3 lateral faces.

    Plus the base, this makes 4 faces.

    Each face has an area of 30 mm².

    Therefore, the surface area of the pyramid = 4 * 30 = 120 mm²
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