question 72?

A simple closed polygon consists of n points in the plane joined in pairs by n line segments: each point is the endpoint of exactly 2 line segments. Following are two examples. a. Use the first principle of induction to prove that the sum of the interior angles of an n sided simple closed polygon is (n - 2)180 degree for all n greaterthanorequalto 3 b. Use the second principle of induction to prove that the sum of the interior angles of an n sided simple closed polygon is (n - 2) 180 degree for all n greaterthanorequalto 3. The Computer Science club is sponsoring a jigsaw puzzle contest. Jigsaw puzzles are assembled by fitting 2 pieces together to from a small block, adding a single piece to a block to form a bigger block, or fitting 2 blocks together. Each of these moves is considered a step in the solution. Use the second principle of