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Posting images is easy.  Just click on the upload Image button above the answer edit box.

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post-16621

Ah…ok.

I kept clicking on the Add Media button and got error trying to upload.

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Lol.  Oops no smilies here… :p

Wait.  The Add Media is supposed to work too.  Need to report this.

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Essentially, the area of 1 piece of shaded part C

= Area of entire square – Area of 1 large quadrant (B) – Area of 1 small quadrant (A)

Area of entire square = 20 x 20 = 400 cm2

Area of large quadrant (B) = pi x 20 x 20 / 4 = 22 / 7 x 20 x 20 /4 = 314.3 cm2

Area of small quadrant (A) = (Area of entire square – Area of circle in square) / 4

= (400 – (pi x 10 x 10)) / 4

= 21.4 cm2

Area of C = 400 – 314.3 – 21.4 = 64.3 cm2

Hence Area of shaded part = 2 x Area of C = 128.6 cm2

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