Finding the Area of a Circle using the Unit Circle

Please see the attached file for the fully formatted problems.

Given square is 11*11, unit square is 1*1 without using any algebraic equation by
using scissors or folding it, we can find the area of 11*11 square in terms of unit square.

With a similar idea we can do triangles (Main triangle and unit triangle).

Draw a square around each circle (alternatively, according to the problem you could fold it or cut it into squares). So that each side of the square is the size of the diameter. You will have a square that is 18 by 18 and a square that is 2 ...

Solution Summary

The area of a circle is found non-algebraically from the unit circle.

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... 3. The radius of a circle is measured to be (10.5 + 0.2) m. Calculate (a) the area and (b) the circumference of the circle, and give the uncertainty in each ...