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A far off planet is estimated to be at a...

A far off planet is estimated to be at a distance D from the earth. If its diametrically opposite extremes subtend an angle `theta` at an observatory situated on the earth, the approximate diameter of the planet is

A

`theta/D`

B

`D/theta`

C

`Dtheta`

D

`1/(Dtheta)`

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The correct Answer is:
C
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