finding x

[sage ice]

Ask yourself, what do you have ?

You have an angle
One side 9.3

And an unknown which is adjacent to this angle

The word adjacent means "next to"

There is one formula that include "adjacent" side

[tired lantern]

yes

[sage ice]

Actually, only one

Which is cosine !

[tired lantern]

so i use the cosine rule?

[sage ice]

Yes

But !

You can compute the third angle if you wanted

And use sine rule

There are many ways

[tired lantern]

but i dont know how to do it with a right angle triangle, ive only been taught with scalence triangels

[sage ice]

Its all about finding the easiest path

What the...

They taught you scalene before right triangles ?!

[tired lantern]

yes

[sage ice]

Its okay...

Very bad educational choice

But

It doesnt matter

In a right triangle, the trigonometric formulas have very simple expressions

Cos(angle) = adjacent/hypotenuse

Im really surprised you have never seen this

[sage ice]

How come you said "yes" here

If you had not know this formula 😦

Had you seen in in previous classes ?