In right angled DeltaABC, BDbotAC. If AD...

In right angled `DeltaABC`, `BDbotAC`. If `AD=4`, `DC=9`, then find `BD`.

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DeltaABC is a right triangle , right angled at A and ADbotBC . If AB= c and AC = b, then AD is equal to

`(bc)/(sqrt(b^(2)+c^(2)))`

`(bc)/(b^(2)+c^(2))`

`(b^(2)c)/(sqrt(b^(2)+c^(2)))`

None of these

In DeltaABC, /_A is right angle and AD is perpendicular to BC . If AD=4cm, BC=12 cm, then value of (cot B+cot C) is

`6`

`3`

`4`

`(3)/(2)`

In. the figure the angles BAD and ADC are right angles and AE I I BC, if AB = BC = 5 cm and DC= 9 cm, find AD.

3 cm

4 cm

12 cm

6 cm