A focus of an ellipse is at the origin. The directrix is the line `x=4` and the eccenricityh is `1/2`, then length of semi-major axis is

A focus of an ellipse is at the origin the directrix is the line x=4 and the eccentricity is 1/2 . Then the length of semi major axis is

A focus of an ellipse is at the origin. The directrix is the line x =4 and the eccentricity is 1/2 Then the length of the semi-major axis is

A focus of an ellipse is at the origin. The directrix is the line x =4 and the eccentricity is 1/2 Then the length of the semi-major axis is

A focus of an ellipse is at the origin.The directrix is the line x=4 and the eccentricity is (1)/(2) Then the length of the semi-major axis is

A focus of an ellipse is at the origin. The directrix is the line x""=""4 and the eccentricity is 1/2. Then the length of the semimajor axis is (1) 8/3 (2) 2/3 (3) 4/3 (4) 5/3

A focus of an ellipse is at the origin. The directrix is the line x""=""4 and the eccentricity is 1/2. Then the length of the semimajor axis is (1) 8/3 (2) 2/3 (3) 4/3 (4) 5/3

A focus of an ellipse is at the origin. The directrix is the line x = 4 and the eccentricity is 1/2 . Then the length of the semi - major axis is