Perpendicular lines are vertical lines that form a right angle between them, that is, an angle of degrees.
Perpendicular lines appear in many geometric shapes, such as a rectangle, a square, a right triangle, and others.

Perpendicular lines are vertical lines that form a right angle between them, that is, an angle of degrees.
Perpendicular lines appear in many geometric shapes, such as a rectangle, a square, a right triangle, and others.
What do the four figures have in common?
Perpendicular lines that form a degree angle between them.
Perpendicular lines in a right triangle.
Perpendicular lines in a rectangle: the adjacent sides in the rectangle are perpendicular to each other.
What do the 4 figures below have in common?
Let's first think about the different definitions of various lines.
We can see that what is common to all of the lines is that they intersect each other, meaning they have a point of intersection.
Remember that lines that cross each other are lines that will meet at a certain point.
Therefore, the correct answer is (a).
All show intersecting lines.
What do the four figures have in common?
Let's remember that perpendicular lines are lines that form a 90-degree angle with each other.
Parallel lines are lines that will never intersect and do not form any angle between them.
In order to examine the types of angles that lines form with each other, we will draw a T at the intersection point of the lines in the following way:
Note that from the drawings we can see that what they all have in common is the right angle, which means that all the lines are perpendicular.
All show perpendicular lines.
Which lines are perpendicular to each other?
Let's remember that perpendicular lines are lines that form an angle of 90 degrees between them.
In each of the answers, we will draw the letter T at the point of intersection of the lines.
Let's examine figure A:
We notice that the lines do form a right angle and the lines are perpendicular to each other.
Let's examine figure B:
We notice that the lines do not meet and do not form any angle; therefore, they are parallel lines and not perpendicular.
Which of the lines are perpendicular to each other?
Let's remember that perpendicular lines are lines that form a right angle of 90 degrees between them.
In each of the answers, we will draw the letter T at the point of intersection of the lines.
Let's examine figure A:
We will notice that the lines do not form a right angle, and therefore are not perpendicular.
Let's examine figure B:
The lines do indeed form a 90-degree angle and are therefore perpendicular.
Let's examine figure C:
We notice that the lines do not form a right angle, and therefore are not perpendicular.
Which lines are perpendicular to each other?
Let's remember that perpendicular lines are lines that form a right angle of 90 degrees between them.
The only drawing where it can be seen that the lines form a right angle of 90 degrees between them is drawing A.
Determine which lines are parallel to one another?
What can be said about the lines shown below?
What do the four figures have in common?