How many pairs of perpendicular lines are there in the square below?
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How many pairs of perpendicular lines are there in the square below?
Let's remember that perpendicular lines are lines that form a right angle of 90 degrees between them.
Our right angles are:
The lines that form angle ABC are: AB+BC
The lines that form angle BCD are: BC+CD
The lines that form angle CDA are: CD+DA
The lines that form angle DAB are: DA+AB
Since in a rectangle we have 4 marked angles of 90 degrees, we must have 4 pairs of perpendicular lines.
4
What do the four figures below have in common?
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