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Converse of the Pythagorean Theorem. PYTHAGOREAN THEOREM. Determining if a Triangles is Acute, Right, or Obtuse. If c 2 > a 2 + b 2 , the triangle is obtuse. If c 2 = a 2 + b 2 , the triangle is right. If c 2 < a 2 + b 2 , the triangle is acute.
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Determining if a Triangles is Acute, Right, or Obtuse • If c2 > a2 + b2, the triangle is obtuse. • If c2 = a2 + b2, the triangle is right. • If c2 < a2 + b2, the triangle is acute. • Remember a + b > c, or it is not a triangle.
Determine whether each of the following is a triangle. If so, tell whether it is acute, right or obtuse. • 7, 8, 9 • 5, 12, 13 • 8, 11, 19 • 8, 15, 22
Homework • Pg. 436: 3-5, 8-10 • Pg. 444: 3-23(odds)