Question

if the distance between the points (acos48 degrees, 0) and (0, acos12 degrees) is d, then d^2-a^2=?


Pls give me a proper and correct answer​

Answer 1

Dette er ikke svaret ditt☹️

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Let the height of the tree be y and width of the river be x and CD = 40 m

In ΔABD, tan 300 =

A

x

+

40

⇒ x+40 = y

√

3

………..(i)

In ΔABC,

tan 600 =

A

=

y

x

⇒ y = x

√

3

……………(ii)

Putting the value of y from (ii) to (i)

x+40= [x

√

3

]

√

3

= 3x

40 = 2x

⇒ x= 20

y = x

√

3

= 20

√

3

Height of the tree = 20

√

3

m

Width of the river = 20 m.

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