Measure Tool

MrLadas shared this problem 2 years ago

Not a Problem

I am an elementary teacher trying to use the measure tool with my students to create ratios of perimeter to diameter of regular polygons. When we measure the perimeter of a regular polygon, and divide it by the diameter (based off of the values from the 'measure' tool), we do not get consistent answers. Are we using the measure tool incorrectly?

Thank you,

Peter

The same problem

Comments (9)

Noel Lambert ● 2 years ago

Bonsoir,

que désigne le "diameter" ?

le plus simple serait de poster un fichier

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Noel Lambert ● 2 years ago

Pour moi, pour n >=4 et n pair, cela peut s'illustrer ainsi

Files: peridiam.ggb

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MrLadas ● 2 years ago

Merci,

I hope my example makes sense.

Files: Test Perimeter-...

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Noel Lambert ● 2 years ago

yes

but same answer as Mike

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Michael Borcherds ● 2 years ago

Perimeter(poly1) / DB
Perimeter(poly1_{1}) / distanceD1B1
Perimeter(poly1_{2}) / distanceD2B2

all give the same for me

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MrLadas ● 2 years ago

I did not record this way. Thank you. I am new using this GeoGebra. I did it by calculator - I figured out the problem ... I am using the rounded values, which is inaccurate. How do you use the calculator on GeoGebra to be more accurate?

Thank you so much.

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Michael Borcherds ● 2 years ago

Maybe change Settings -> Rounding to show more digits

You can also type in what I've put above

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MrLadas ● 2 years ago

Michael,

You are kind to be so helpful. Thank you. I found the digits setting for rounding. The only other thing is your 'Perimeter...' formulae. Is that just typed in manually, or is there a tool to create these calcuations?

Peter

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Michael Borcherds ● 2 years ago

You can type it or use the tool:

/md6vl8nV3dsC7o+P8HN5eCVRC2secAAAAASUVORK5CYII=

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