A discussion of a problem, with justification, may be useful in setting up the need for proof. Jolie travels from Saskatoon to North Battleford, a distance of 120 km. State which type of argument is being used in each case. Also, state whether the conclusion reached is valid. Mary's mother stated that she was poor in writing, so therefore, Mary was likely to be poor in writing.
Silver is a horse.
Joan ate brunch at Cody's restaurant two Sundays in a row. She saw Brie there both times. Joan told her friends that Brie always eats brunch at Cody's. Vertically opposite angles are congruent. Angles A and B are vertically opposite.