The Explanation in terms of ∠ B E C is that to make AB perpendicular to CD, one has to move point B till the angle between the lines, BEC is said to measures 90 degree.
What are perpendicular angles?
A perpendicular angle is known to be an angle that is seen on a straight line and it is said to be one that tends to makes an angle of 90° with any other line.
Note that 90° is also known to be a right angle and it is one that is often denoted or marked by a little square that tend to exist between two perpendicular lines.
Therefore, the two lines are said to intersect at a right angle, and so are known to be perpendicular to one another.
Hence, The Explanation in terms of ∠ B E C is that to make AB perpendicular to CD, one has to move point B till the angle between the lines, BEC is said to measures 90 degree.
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