Greeting Card

Asked by SSHHII | 7th Aug, 2009, 10:50: PM

Expert Answer:

The un folded card will look like:

 

Now the Area of square = (side)2

                                            = (10)2 = 100 cm2

Folded greeting card would look like:

Area of a semi circle = ( r2)/ 2

                                      = (3.14 x 5 x 5)/ 2 = 39.25 cm2

Area of 4 semi circles = 4 x 39.25 = 157 cm2

The protion shaded in red is the hidden region.

Area of hidden region = Area of 4 semicircles - Area of square

                                        = 157 cm- 100 cm2

                                        = 57 cm2

 

Answered by  | 24th Aug, 2009, 12:17: PM

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