The phrase "approximately circular shape" is correct and usable in written English.
You can use this phrase to describe objects that have a circular shape, but may have some variation in its roundness. For example, "The pool was filled with colorful stones in an approximately circular shape."
Fogo (476 km2) is the fourth largest island in the archipelago of Cape Verde with a roughly circular shape (approximately 25 km of a diameter).
The city is laid out in a roughly circular shape, with the religious edifices and monuments located in the centre and avenues radiating outward to approximately 12 neighbourhoods, such as Malikābād, Sajjād, Shahrak-e Azadi, Kuy-e Imām Riḍā, and Sīsābād.
Shell surfaces incorporate dense patterns of pores that are approximately circular in shape and their size varies in the narrow interval p s = 200 ± 40 nm (Fig. 1b, c).
These lesions had approximately circular or elliptical shape and their shape remained similar at two timepoints, enabling us to make meaningful size comparisons based on the assumption described earlier.
This is less of a problem with islands (of any size) that are approximately circular in form but does pose challenges for those that are less uniformly shaped.
In this paper, we use a circular shape to approximately cover the ideally proposed hexagonal pattern in HAP coverage area.
We used the grid-based numerical approach implemented in Programita to estimate g(d), because this method prevents biases due to edge effects regardless of the study area shape [ 33]; in our case this shape corresponds to the approximately circular viewing field through the microscope.
Separate the flesh from the rind by cutting in a circular shape around the center.
All the pores are in circular shape with average pore diameter of approximately 40 nm and average inter-pore distance of approximately 65 nm. Figure 2c,d shows the cross-sectional images of AAO template which reveals that the nanopores or nanochannels are very straight and parallel throughout their entire length.
