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Warm-Up • Find the value of x. 32 20° x Geometry 8-4 Angles of Elevation and Depression Plus: 5-7 Acute, Right, or Obtuse? Definition • An angle of elevation is the angle formed by a horizontal line and a line of sight to a point above the line. • An angle of depression is the angle formed by a horizontal line and a line of sight to a point below the line. • Angles of elevation and depression are congruent because they are alternate interior angles. Example • Identify each angle as an angle of elevation or depression. 5-7 Acute, Right, or Obtuse? • Use the Pythagorean theorem to determine if a triangle is acute, right, or obtuse. • If… • a2 + b2 > c2 – Then the triangle is acute • a2 + b2 = c2 – Then the triangle is right • a2 + b2 < c2 – Then the triangle is obtuse Examples • Determine whether each triangle is acute, right, or obtuse. 7, 5, 10 9, 26, 25 13, 12, 5