Answer:
89.4 yd
Explanation:
Surface area of a triangular pyramid = B × H ÷ 2
6 × 5.2 ÷ 2 = 15.6
6 × 8.2 ÷ 2 = 24.6
15.6 + 24.6 + 24.6 + 24.6 = 89.4
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