From a group of 21 astronauts that includes 12 people with previous experience in space flight, a 3-person crew is to be selecte
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Check the picture below.
well, since the triangle is an isosceles, with twin sides and twin angles at the "base", let's check what the angle at R is, 15(7) - 31 = 74, and her twin sister at T is also 74, that means that the angle at S is 180 - 74 - 74 = 32.
