The angle of elevation of a tower at a l...

The angle of elevation of a tower at a level ground is `30^(@).` The angle of elevation becomes `theta` when moved 10 m towards the tower. If the height of tower is `5 sqrt3` m, then what is the value of`theta` ?

a.`(1)/(sqrt(2))`

b. `(1)/(2)`

c.`(sqrt(3))/(2)`

d.`(2)/(sqrt(3))`

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