Go to your drawing table. Draw a horizontal line and a vertical line. Where they intersect place your compass point and draw a 10 inch(or 10 cm) arc intersecting both lines. now measure a point from the center out 0.8715 inches (or cm) [this is equal to 10cos(85)] and place a mark on the horizontal line. draw a vertical line from this point to the arc. Draw a dark line from where this vertical intersects the arc to the center. Darken the horizontal line. these two darkened lines form an 85 degree angle.
remember the formula: [radius] x cos(angle)
note: the larger the arc the more accurate the angle .
To create an 85-degree angle with a compass, first draw a straight line (the base of the angle). Place the compass point on one end of the line and draw an arc that intersects the line. Without changing the compass width, place the compass point on the point of intersection and draw another arc. Measure 85 degrees using a protractor from the base line to mark the angle, then draw a line from the vertex to this mark to complete the angle.
To bisect an 85-degree angle, start by drawing the angle with its two rays. Next, place the compass point at the vertex of the angle and draw an arc that intersects both rays. Without changing the compass width, place the compass point at each intersection point and draw two arcs that intersect each other. Finally, draw a line from the vertex through the intersection of the arcs; this line bisects the 85-degree angle into two equal 42.5-degree angles.
you first measure it on your protractor correctly then you use it:)
With a protractor and a straight edge.
use trisection method
Use a ruler
pad khaoo !!
you first measure it on your protractor correctly then you use it:)
In conjunction with a straight edge and a protractor.
With a protractor and a straight edge.
By bisecting a 15 degree angle with a straight edge and a compass.
use trisection method
It is possible to construct a 20 degree angle using only Ruler and Compass. I happened to stumble across a method that is highly accurate. It is posted on my blog. Check the related link
by 60 degree and 90 degree
A 10 degree angle cannot be constructed using only a compass and straight edge.
There are 60 minutes in 1 degree.
If you mean the difference between a compass and a compass rose: The compass is the complete instrument. The compass rose is the degree wheel printed under the needle.