If you mean "Does it have a rotational symmetry", the answer is "Yes." there is a 180 degree rotational symmetry.
Simply that it is an asymmetric shape.
Rotational symmetry counts how many times a shape will fit onto itself when it is rotated 360°. When an oval (I assume you mean an ellipse) is rotated it will fit onto itself after 180°, thus it has rotational symmetry (of order 2).
A trapezium does not have rotational symmetry.
It has 8 rotational symmetry.
Haumea's rotational period is 3.9155 hours.
The rotational period of the Andromeda Galaxy is estimated to be around 1 billion years. The exact time can vary depending on the specific region of the galaxy being measured.
Saturn has a sidereal rotational period of 10.57 hours and a rotational velocity of 9.87 km per second. Because of its gaseous composition, it has a varying rotational period at the poles which is about 10 hours 45 minutes.
7.8 hours
Io's rotational period, or the time it takes for the moon to complete one full rotation on its axis, is approximately 42.5 hours. This means that a day on Io lasts around 42.5 Earth hours.
The rotational period of Venus is 243 Earth days.
Mars has a rotational period of 24.6 hours.
Pluto has a rotational period equal to 153.3 hours.
Rotation means the planet spinning about it axis. (Orbit the the path of the planet round the Sun). The planet Mercury has a rotational period of 58.646 Earth days. The planet Venus has a (retrograde) rotational period of 243.0185 Earth days. The planet Mars has a rotational period of 1.025957 Earth days. The planet Jupiter has a rotational period of 9.925 hours. Obviously Earth has a rotational period of 1 Earth day.
There are no planets in our solar system with a rotational period of 318 days. The longest is Venus, with a rotational period of 243 days.
Uranus.
30048.135 days