Help with these Math questions

Cuong
Sat, 24 Nov 2007 19:49:44 +0000

Ohm, I am suck in math, but relatively sensitive to Geometry, so here is my working out in problem 4. I am not sure it is correct or not, other folks shall check it I guess. Meanwhile I hope you can follow :)

Since they say the total area of the entire shape = 9/4, I divide the picture up to 2 parts: a square with all sides = 1 and a rectangle with width = 1 and length = x



http://i191.■■■■■■■■■■■■■■■/albums/z119/Boleslaw_I/24.jpg



Area of the entity = Area of Square + Area of Rectangle

Area of square = 1^2 = 1

Area of rectangle = 9/4 - 1 = 5/4

Now the area of the rectangle = Width * Length
Thus 5/4 = 1 * x
that is x = 5/4 = 1.25

Now you can wrap things up: The perimeter of the entity should be:

2 + 1 + 1 + 1 + 1.25 = 6.25

But there is also a part small part that I marked red, this part = 0.25

So my answer is 6.5

Please check, I have no idea.