How many vertices are shown in the figure?
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How many vertices are shown in the figure?
Note that perpendicular lines are straight lines that create a 90-degree angle at their intersection point.
Let's locate the intersection points that create right angles in the drawing:
The lines that create the marked right angles are:
AB is perpendicular to CD
AB is perpendicular to EF
EF is perpendicular to IJ
IJ is perpendicular to GH
Therefore, there are 4 perpendicular lines in the drawing.
5
What do the four figures have in common?
A vertex is a point where two or more lines intersect to form an angle. Think of it as a corner where lines meet!
Some points like A, B, I, and J are just endpoints of lines, not intersection points. Only points where lines actually cross each other count as vertices.
Look for the small square symbols in the diagram! These mark the right angles (90°) where perpendicular lines intersect, creating true vertices.
No! You just need to identify where lines intersect. The square markers help you spot the perpendicular intersections, but any line intersection creates a vertex.
Follow each line carefully and mark where it crosses another line. Use the labels and square markers as guides to help identify the intersection points.
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