1. Calculate the surface area of the rectangle. (L x W) [600]

2. Calculate the area [A] of the top right and bottom left circles. (A = pi x r^2) [78.5] and [314]

3. Calculate the area of the circles encompassing the rectangle, which appears to be 1/4. [19.63] and [78.5]

4. Add the quarter circle areas [98.13]

5. Subreact the area in #4 from the total surface area in #1. [501.87]

The only part I can't get is how to get the rounded edges from the top left and bottom right.

Edit: see my response to the first reply.

1. Calculate the surface area of the rectangle. (L x W) [600]

2. Calculate the area [A] of the top right and bottom left circles. (A = pi x r^2) [78.5] and [314]

3. Calculate the area of the circles encompassing the rectangle, which appears to be 1/4. [19.63] and [78.5]

4. Add the quarter circle areas [98.13]

5. Subreact the area in #4 from the total surface area in #1. [501.87]

The only part I can't get is how to get the rounded edges from the top left and bottom right.