what_is_the_circumference_of_a_circle_of_radius_2m

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12.5663706143592 metres is the circumference of a circle with radius 2 metres.

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How do we know?

What is the circumference (length around the outside) of a circle with a radius (half diameter) of the height 2 metres?

Facts
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Reasoning

I followed this chain of reasoning:

By calculation (generator: ["now@trueknowledge.com"]) I know that:

The current time is July 31st 2014, 15:42:19

The current time is July 31st 2014, 15:42:19

By calculation (generator: ["instance_number@trueknowledge.com"]) I know that:

2 is a number

2 is a number

By calculation (generator: ["numbers_are_numeric@trueknowledge.com"]) I know that:

2 is a numeric quantity

2 is a numeric quantity

By calculation (generator: ["equals1@trueknowledge.com"]) I know that:

2 is the same as 2

2 is the same as 2

By calculation (generator: ["approximation_from_accurate@trueknowledge.com"]) I know that:

2 is the approximate value of 2

2 is the approximate value of 2

I know from locally stored knowledge that:

3.14159265358979323846 is the approximate value of Pi ([fact: ["192033846@trueknowledge.com"]])

3.14159265358979323846 is the approximate value of Pi ([fact: ["192033846@trueknowledge.com"]])

By calculation (generator: ["product@trueknowledge.com"]) I know that:

6.28318530717959 is the product of 2 and 3.14159265358979323846

6.28318530717959 is the product of 2 and 3.14159265358979323846

By calculation (generator: ["product_by_approximation@trueknowledge.com"]) I know that:

6.28318530717959 is the product of 2 and Pi

6.28318530717959 is the product of 2 and Pi

By calculation (generator: ["product@trueknowledge.com"]) I know that:

12.5663706143592 is the product of 2 and 6.28318530717959

12.5663706143592 is the product of 2 and 6.28318530717959

By calculation (generator: ["strictequal1@trueknowledge.com"]) I know that:

12.5663706143592 metres is strictly equal to 12.5663706143592 metres

12.5663706143592 metres is strictly equal to 12.5663706143592 metres

By calculation (generator: ["circumference_from_radius@trueknowledge.com"]) I know that:

Fact 1: 12.5663706143592 metres is the circumference of a circle with radius 2 metres

Fact 1: 12.5663706143592 metres is the circumference of a circle with radius 2 metres

By calculation (generator: ["perm5@trueknowledge.com"]) I know that:

Fact 1 is true for all time

Fact 1 is true for all time

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:

Fact 1 is true at July 31st 2014, 15:42:19

Fact 1 is true at July 31st 2014, 15:42:19

I know from locally stored knowledge that:

permanent applies to is the circumference of a circle with radius ([fact: ["1133381522@trueknowledge.com"]])

permanent applies to is the circumference of a circle with radius ([fact: ["1133381522@trueknowledge.com"]])

I used the following facts to provide this answer:

3.14159265358979323846 is the approximate value of Pi

'is the circumference of a circle with radius' is permanent

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- what is the circumference of a circle of radius 2m