In the given image, the two of the lines are perpendicular lines this is because the angle between the two line is a right angle.
What is a right angle?
A right angle in geometry and trigonometry is an angle that is exactly 90° or π/2 radians, equal to a quarter rotation. Right angles are formed when a ray is arranged so that its terminus is on a line and the neighboring angles are equal.
For any two lines to be perpendicular the angle between the two lines should be equal to 90°. Also, a right angle triangle when ever formed is represented by a small square instead of a curve.
Now, as in the given image the measure of the angle between the two lines is represented by a small square.
Hence, in the given image, the two of the lines are perpendicular lines this is because the angle between the two line is a right angle.
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