No it isn't
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A rectangle
The greatest area for a fixed perimeter will be when all the sides are equal or when the rectangle approaches the shape of a square.
It's actually not. The circle is the weakest shape. The more places that a shape can hinge (the more corners it has), the weaker it is. Since a circle has an infinite number of these, it is the weakest shape.
The shape is all of the following: -- quadrilateral -- parallelogram -- rectangle -- rhombus -- square
you split your shape in half, (The rectangle and the triangle), by putting a line through it and then calculate the area of the rectangle and then calculate the area of the triangle, half the area of the triangle then add the area of the triangle and the rectangle together!Then you should have your answer!