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Informal Statements

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Question
Answer
Informal Statement 1   The sum of the three angles of a triangle is equal to one straight angle.  
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Informal Statement 2   Two straight lines can intersect at only one point.  
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Informal Statement 3   A line can be divided into two equal parts by only one point.  
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Informal Statement 4   A given angle can be divided into two equal parts by only one line.  
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Informal Statement 5   All straight angles are equal.  
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Informal Statement 6   All right angles are equal.  
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Informal Statement 7   Only one perpendicular can be drawn to a line at a point in the line.  
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Informal Statement 8   Complements of equal angles or of the same angle are equal.  
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Informal Statement 9   Supplements of equal angles or of the same angle are equal.  
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Informal Statement 10   The sum of all the angles about a point on one side of a straight line through the point is a straight angle.  
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Informal Statement 11   The sum of all the angles about a point is equal to 360 degrees.  
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Informal Statement 12   If the sum of two adjacent angles equals a straight angle, their exterior sides form one straight line.  
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Informal Statement 13   When two straight lines intersect, the vertical angles formed are equal.  
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Informal Statement 14   The sum of two sides of a triangle is greater than the third side.  
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