Determine how many pairs of perpendicular lines are there in the two squares shown below:
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Determine how many pairs of perpendicular lines are there in the two squares shown below:
Remember that perpendicular lines are lines that intersect at a right angle of 90 degrees.
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
The lines that form angle EFG are: EF+FG
The lines that form angle FGH are: FG+GH
The lines that form angle GHE are: GH+HE
The lines that form angle HEF are: HE+EF
Given that we have 8 marked right angles of 90 degrees in the squares, we must have 8 pairs of perpendicular lines.
8
What do the four figures below have in common?
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