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How do you mark 72 a number hole in 1385 mm pitch circle diameter?
To mark the 72nd hole on a pitch circle diameter of 1385 mm, you need to first calculate the angular distance between each hole. The formula for this is 360 degrees divided by the number of holes. In this case, it would be 360 degrees divided by 72, which equals 5 degrees per hole. To mark the 72nd hole, you would measure 5 degrees from the starting point on the pitch circle diameter and make your mark.
How do you mark equidistant points on circle?
It is the radius from the centre to the circumference or the diameter passing through the centre to both sides of the circumference
How do you divide a circle into thirds?
Assuming you know the location of the center of the circle, to divide a circle into thirds, do the following:mark a point on the circumference and, using a protractor, mark 120 degreesthen repeat for the final markA line from the mark on the circumference to the center will show an angle of 120 degrees.
How do you find the perimeter of a flat shape?
"Flat shape" is a broad description that can be categorized into several more specific descriptions. For example, polygons, circles, and the outline of an irregular object such as a giraffe can all be described as flat shapes. For polygons, which are closed shapes with 3 or more straight sides, the perimeter is the sum of the lengths of the individual sides. The perimeter of a circle is pi (3.14) times the length of the diameter of the circle. A diameter is any line that connects two points on the edge of the circle and passes through the center. Other shapes have more specific perimeters, but in general, a flat shape's perimeter is the length of string that would be required to fully mark the outline of the shape.
How is diameter measured?
Let us assume you have a circle drawn with the center identified. Then draw one straight line through the center. Measure the length of the line bound by the intercepts of the straight line with the circumference of the circle. The line segment is the diameter. Another case would be that you have a circle drawn with no center marked. Draw one straight line through the circle. Use a compass to draw the perpendicular bisector of the line segment bound by the intercepts of the straight line with the circumference of the circle toward the inner circle (the center of a circle cannot lie outside the circle!). Repeat drawing another (different) straight line through the circle and finish with a perpendicular bisector. The two bisectors will intercept at the center of the circle. Then you can proceed the same way as described in the first paragraph above. Hint to draw a perpendicular bisector of a line segment: take one end of the compass, pivot the point at one end of the line segment and mark an arc with the other end on both sides of the line. Move the compass and pivot one point at the other end of the line segment. Mark an arc with the other end on both sides of the line. If the procedure is done correctly, the two arcs, one from each end, should intercept on one side of the line. There is another intercept of the two arcs on the side of the line. Connect the two arc-intercepts with a straight line. Convince yourself that the line bisects the straight line at a right angle. This last line is the perpendicular bisector of the original line (The first and last lines form the perpendicular bisector of one another). ===================
