Alex draws a scalene triangle. One of the angles is 80°.
Which of the following could be the difference between the other two angles in Alex's triangle?
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The sum of the angles in a triangle is 180°. Therefore, as one of the angles in Alex's triangle is 80°, the sum of the other two angles is 100°. It follows that the difference between these angles is less than 100°. ... So the triangle would have two angles of 80°, which is impossible for a scalene triangle
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The sum of the angles in a triangle is 180°. Therefore, as one of the angles in Alex's triangle is 80°, the sum of the other two angles is 100°. It follows that the difference between these angles is less than 100°. So the triangle would have two angles of 80°, which is impossible for a scalene triangle
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