Question

is semi spere is a three dimensional shape​

Answer 1

first of all mate it's hemisphere not semi sphere.

it is three dimensional

Answer 2

Yes , a spheroid is a three-dimensional shape that can look like either a stretched or a flattened sphere. A spheroid is the shape that is traced out by rotating an ellipse about one of its two main axes. ... Each semi-axis of the equatorial axes is an equatorial radius of the spheroid.