a) In E5, find the sides and angles of the triangle with vertices
(1, 2, 3. 4, 5), (5, 4, 2, 3, 1), and (2, 2, 2, 2, 2).
b) Prove: In En the sum of the angles of a triangle is π. [Hint: For a triangle with sides b, c in En, construct the triangle with the same sides in the plane E2; why is this possible? Then show, with the aid of the Law of Cosines, that corresponding angles of the two triangles are equal]
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