Determining percentage of irregular shape in a circle (1 Viewer)

[Senor Schmutzig]

Does anyone know of an online tool that will tell me the percentage of a circle that is contained within an irregular shape within that circle? I can't find anything that will give me that percentage. Ultimately, it would allow me to draw a shape within a circle and it would tell me what percentage of that circle is enclosed in the shape. It's for a landscaping plan that I am putting together and I'm trying to determine the percentage of the root zone of a tree that will be impacted by some root pruning that is being done. 

 

[Bucky86]

Pizza.

 

[moleculo]

Does anyone know of an online tool that will tell me the percentage of a circle that is contained within an irregular shape within that circle? I can't find anything that will give me that percentage. Ultimately, it would allow me to draw a shape within a circle and it would tell me what percentage of that circle is enclosed in the shape. It's for a landscaping plan that I am putting together and I'm trying to determine the percentage of the root zone of a tree that will be impacted by some root pruning that is being done. 

Can you calculate the area of the irregular shape?

 

[Dedfin]

Do you have access to a scale and printer?

 

[Joe Summer]

Break up the irregular shape into specific polygons, then use geometry to calculate the area of each polygon.

 

[Scoresman]

We're not doing your kid's homework for you.

 

[need2know]

 

[GregR]

Does anyone know of an online tool that will tell me the percentage of a circle that is contained within an irregular shape within that circle? I can't find anything that will give me that percentage. Ultimately, it would allow me to draw a shape within a circle and it would tell me what percentage of that circle is enclosed in the shape. It's for a landscaping plan that I am putting together and I'm trying to determine the percentage of the root zone of a tree that will be impacted by some root pruning that is being done. 

Use an online tool and draw just the part of the shape that is inside the circle. Get the area from the tool.

Use math and determine the total area inside the circle.  Area =  3.14159 * radius2     Or, just draw the circle in the tool separately and get its area.

Percent in the circle =    ShapeArea  /  CircleTotal

 

[AAABatteries]

Is it @Arizona Ron or @Jaysus who does the CAD drawings?  All those black guys look alike to me.

 

[Senor Schmutzig]

Open the image in an image viewing program, then use the cursor to find the XY coordinates of boundaries of the irregular shape. Use math to find the total area.

Subtract the total area of the circle given the XY coordinates of its center and an edge.

That sounds like the easiest method. 

There are actually two shapes. One is a segment of the circle but not necessarily from the middle. There will also be a square in the circle. 

 

[Senor Schmutzig]

We're not doing your kid's homework for you.

Not homework. I believe it was sufficiently explained in the initial post. 

TLDR - Need help measuring percentage area of a shape within a circle. Not homework. TIA. 

 

[Senor Schmutzig]

Do you have access to a scale and printer?

Yes.

 

[Mister CIA]

Pizza.

Bat signal: @Ministry of Pain

 

[Nugget]

Area of shape divided by area of circle = percentage. 

 

[Ilov80s]

Area of shape divided by area of circle = percentage. 

This X100

 

[Dedfin]

Yes.

This is high school level stuff then right?  Print the sketch out, weight the sketch, then cut out the shaded section and weigh that.  The ratio is the %.  Obviously you need a kitchen or drug scale, not a bathroom scale.  I don't know of a program that gives you area of an irregular shape, but maybe there is one.

 

[Senor Schmutzig]

This X100

Area of shape divided by area of circle = percentage. 

It's an irregular shape and I'm not sure how to get the area of it. 

 

[Senor Schmutzig]

I"m just going to go with the fact that there isn't an easy way to do this. :bangshead:

 

[GregR]

I"m just going to go with the fact that there isn't an easy way to do this. :bangshead:

http://lmgtfy.com/?q=area+irregular+shape+tool

 

[pecorino]

I do free-lance mathematics on the side so I'd be happy to help. I charge $60/hour. PM me if you're interested. I'll hammer it out quickly; business is slow.

 

[Dan Lambskin]

I"m just going to go with the fact that there isn't an easy way to do this. :bangshead:

How accurate do you need to be?  Can't you estimate the area of the irregular shape?

 

[rascal]

We need more details...first is this for real life or a school problem?  Please provide as many details as possible.