R is the range on a horizontal plane for...

`R` is the range on a horizontal plane for a shot with the same velocity at two different angles of projection. If ` h` and `h'` be the greatest heights attained corresponding to these angles of projection, what is ` R^2` equal to ?

`R = 4 sqrt((hh))`

`R =h/(4h)`

R = 4 h h'

`R = sqrt(hh)`

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