Last Updated: Feb 19, 2014
URL: http://libguides.mpsaz.net/content.php?pid=109598
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If two sides of two adjacent acute angles are perpendicular, then the angles are complementary.
If two lines intersect to form a linear pair of congruent angles, then the lines are perpendicular.
If two lines are perpendicular then they intersect to form four right angles.
Two Column

Paragraph

Flow

This is the most formal type of proof. It lists numbered statements in the left column and a reason for each statement in the right column 
This type of proof describes the logical argument with sentences. It is more conversational than a twocolumn proof. 
This Type of proof uses the same statements and reasons as a twocolumn proof, but the logical flow connecting the statements is indicated by arrows. 
Statement

Reasons

1. <A @ <X
<B @<Y
BC @ YZ

1. Given

2. <C @ <Z

2.Transitive

3. DABC@DXYZ

3. ASA


If <A @<X; <B @<Y; BC @YZ then we know that <C @<Z by the transitive property of angles. By the ASA
postulate we now know DABC@DXYZ. 
