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12 September, 16:20

The area of the base (B) of a triangular pyramid is 28 cm. The perimeter (p) is 20 cm, and the slant height (S) is 5 cm. Determine the pyramid's surface area.

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  1. 12 September, 20:15
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    78 cm²

    Step-by-step explanation:

    SA = BA + p x Sh / 2

    SA = 28 + 20 x 5 / 2 = 78
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