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O, IN TOTAL IT IS 15%! CHECK PICTURE
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Answer:
The surface area is equal to
Step-by-step explanation:
The surface area of the triangular pyramid is equal to the area of its four triangular faces
so
In this problem
we have
substitute the values
let's bear in mind that sin(θ) in this case is positive, that happens only in the I and II Quadrants, where the cosine/adjacent are positive and negative respectively.