How do you make 85 degree with compass?

Answer 1

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 .