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By using a pair of compasses or depending on what type of triangle it is creating a perpendicular line from one of its vertices to its opposite side.
by folding paper ! :P
what is married segment
mountains
Most rock layers (and ALL sedimentary layers) start out flat. Folding changes the angle of lie (even to perpendicular and beyond).
A rectangle is formed by perpendicular lines that create four 90 degree angles.
Perpendicular describes a relation between two lines or objects which resemble lines. This relation is when when the two lines or similar objects cross (in a two-dimensional plane) they create four 90-degree angles about the intersection point. In other words, the two lines' slopes are opposite reciprocals.
The only difference between perpendicular lines and intersecting lines is that perpendicular lines create a right angle at the point of intersection.
When straight lines are perpendicular to each other they create right angles of 90 degrees
First of all draw a line segment that is about 2 cm long between two points P0 and P1. At the one of the outer points, draw another line that is at an angle of 90 degrees from the first line segment. This will cause the new line segment to stand straight on the first segment. Draw another line segment between the not used endpoint of the new line segment, let's call it P2, and the not used endpoint of the first line segment. This will create a triangle. Now on the P2 endpoint, draw another line segment that is again at 90 degrees angle. Repeat the previous steps and you will have created a root spiral.
i hate earth science