Question

How do I solve this using Sin or Cosine law?

Answer 1

Those two have both two formulas but when dealing with a not-right triangle which is a particular case you use this formula for sines.

`(SinC)/(c) =(SinR)/(r)`

Substitute

Note: the capital letters are for the angles and the small letter are for the sides.

But since we used side R and there is no angle to substitute. you will basically have to find it by adding the two angles given and subtracting it by 180, which is a 100.

`(Sin(7))/(1.9) =(Sin100)/(x)`

now you do the butterfly method or cross multiplication method.

`xsin(7)=1.9sin(100)`

You have to isolate the x

`(xsin(7))/(sin(7)) =(1.9sin(100))/(sin(7))`

now cancel and plug the right side of the equation into your calculator and u get the answer for the missing side.

`x= 15.35` or if u want to round it
`15.4`

<R = 100 and side CK= 15.35 or 15.4

Hope I helped! ^w^

TheOneAndOnlyLara~