Question

Anyone who’s good at trigonometry?

Answer 1

Length y is 8.12cm

Explanation:

Use the law of sines.

`(sin(a))/(A) =(sin(b))/(B)` ⇒
`(sin(39))/(y) =(sin(74))/(12.4)`

`y((sin(39))/(y)) =y((sin(74))/(12.4))`

`sin(39)=y((sin(74))/(12.4))`

`y=(sin(39))/(sin(74)/12.4)`

`y=(12.4*sin(39))/(sin(74))`

y=8.118052433 if you don't round.

Answer 2

Explanation:

u know the sinus theorem for the area of a triangle

u can search it sinus theorem triangle

for the solution:

12.4/sin(74)=y/sin(39)

y=7.85 cm