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Mathman2013

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**. Homework Statement**

The fence is connected to a wall, so you only have to fence in the area formed by the semi-circle.

You have to use 60 meters of fence bought at a hardware store.

## Homework Equations

Area of semi-circle: A = 1/2*Pi*radius^2

Length of the perimeter of a semi-circle. L = Pi*radius + 2*radius

## The Attempt at a Solution

And here is where it become tricky for me.

I know that part of the area which needs to be fenced in is the part formed by the semi-circle and excluding the walled area.

However if the length of the perimeter is L = Pi*radius + 2*radius

Am I allowed to ignore the 2*radius ? In my expression for the perimeter of the semi-circle ? (Because L = Pi*radius + 2*radius how you define length of the perimeter of semi circle according to my textbook. )

Yes or no? Because If I am allowed to ignore it then I get an area of the gras field which is 572 m^2, but if I include the 2*radius in the expression for the Length of the perimeter fence then the area of field is only 212 m^2.

Hope someone here can bring light to my question :)

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