1. the largest area Tony can get is if the rectangular is a square. You know what the perimeter of the square is which is the total length of the fence so you can work out the dimension of the square.

2. the circumference of the circle is also the total length of the fence so you can work out the radius of the circle and from that work out the area of the circle. You can then compare the area of the square and the circle and see which has a bigger area.

3. same as 1, the biggest area is a square. the total length of the fence, however, equals three sides of the square because Tony is using the garage as one of the side. You can work out the side of the square and then calculate the area.

Good luck with your homework!