Surface area = sum of all area, which is the total of 4 triangles and 1 square.
1 square = 9 x9 = 81
each triangle = (6 x 9)/2 = 27
so 4 triangles = 27 x 4 = 108
=> total = 108+ 81 = 189
Answer:
C. 189
Explanation:
Each triangle is 27 which makes it 108, and 108+81=189
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