Answer :

Walexis

Answer:

89.4 yd

Step-by-step explanation:

Surface area of a triangular pyramid = B × H ÷ 2

6 × 5.2 ÷ 2 = 15.6

6 × 8.2 ÷ 2 = 24.6

6 × 8.2 ÷ 2 = 24.6

6 × 8.2 ÷ 2 = 24.6

15.6 + 24.6 + 24.6 + 24.6 = 89.4

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