Circumference for maximum area

[Loki123]

I would think this is correct, but I got that a=b, which means I got a square, and I am supposed to get a rectangle.

 

[skeeter]

a square is a rectangle …

 

[Loki123]

a square is a rectangle …

....
here when we say square we strictly mean that it has all same sides while rectangle means two pairs of the same sides...
so confused rn

 

[skeeter]

Rectangle - Wikipedia

en.m.wikipedia.org

 

[Loki123]

Rectangle - Wikipedia

en.m.wikipedia.org

interesting...is my answer correct then?

 

[skeeter]

interesting...is my answer correct then?

yes

 

[lookagain]

Loki, aside from your work, the problem statement uses the wrong terminology. A rectangle, and any
other polygon, do not have a circumference. They have a perimeter. Circles and ellipses, for examples,
possess a circumference.

 

[Steven G]

A square is a special rectangle.
A square is a special rhombus.
A circle is a special ellipse.
...

What is the intersection of a rectangle and rhombus? That is what figure is both a rectangle and a rhombus?