Question

Find the length of BC Round to the nearest hundredth.

Answer 1

The answer is B i just did it and teacher helped me

Answer 2

Answer:

$a=6\ m$

Step-by-step explanation:

Here,

$m\angle A=18^{\circ}\\\\m\angle C=21^{\circ}\\\\AB=c=7\ m\\\\BC=a=??$

Sine law-

$\dfrac{\sin A}{a}=\dfrac{\sin B}{b}=\dfrac{\sin C}{c}$

Putting the values,

$\Rightarrow \dfrac{\sin 18}{a}=\dfrac{\sin 21}{7}$

$\Rightarrow a=\dfrac{\sin 18\times 7}{\sin 21}$

$\Rightarrow a=6\ m$