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Offline Centres

In $Δ A B C$ the sides b,c are given. If there is an error $δ A$ in measuring angle, ‘A’ then $δ a$ =

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$\frac{Δ}{2 a} δ A$

$\frac{2 Δ}{a} δ A$

be sin $A δ A$

$2 Δ$

answer is B.

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Detailed Solution

$Δ = \frac{1}{2} b c \sin A a^{2} = b^{2} + c^{2} - 2 b c \cos A 2 a δ a = 0 + 0 + 2 b \sin A δ A 2 a δ a = 2.2 Δ δ A δ a = \frac{2 Δ}{a} δ A$

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