Talk:Q238231

Autodescription — disk (Q238231)

description: plane figure, bounded by circle

Classification of the class disk (Q238231)  

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Interwiki conflict
Topic: circular figures	Items involved: Q238231^Talk, Q17278^Talk, Q843905^Talk, Q4115331^Talk	Status: not resolved
Some languages have one word for 2. Present order(may be wrong?): plane figure / curve / its length / area of figure. Also in topology - more general set. Infovarius (talk) 17:27, 11 May 2013 (UTC)[reply]

Unless ca and es articles has "topology" in title, the term is more general (as one can see from other languages). Infovarius (talk) 05:49, 29 May 2013 (UTC)[reply]

No,

\pi r^{2}

And? Your construstion is wrong. If you want, I can consult you for some 20$ :) --Infovarius (talk) 13:08, 6 February 2024 (UTC)[reply]

The area of a circle can be defined by comparing it to a square, as that's the base of area calculation.

A possible way to do it is to cut the circle to 4 quadrants, each placed with their origin on the vertices of a square.

When the arcs of the quadrant circles intersect at the quarter of the centerline of the square, their combined area equals the area of the square.

The ratio between the radius of the circle and the side of the square can be calculated using the Pythagorean theorem.

The area of the circle equals 16 times the right triangle, with legs of a/4 and a/2.

A=(16/5)r²=3.2r²

You have got a mistake. I can demonstrate it to you, see the proposal above. --Infovarius (talk) 22:23, 28 April 2024 (UTC)[reply]

No,

2\pi r