Lengths of sides (Geometry)

[muted crystal]

Lengths of sides (Geometry)

[timid vault]

Remember that the cosine is equal to the length of the adjacent side divided by the length of the hypotenuse.

In your case, this means that $\cos\left(\theta\right)=\frac{12}{a}=\frac{13}{5}$

Do you follow?

[half cloud]

0x

[muted crystal]

yeah. Do I just use Pythagorean theorem for the other sides?

[timid vault]

It's only needed for b. After that, you can take advantage of the fact that the triangles are congruent and take a shortcut.

[muted crystal]

cool thx

[muted crystal]

How do i mark this as solved?

[timid vault]

.solved

[timid vault]

or .close actually

[muted crystal]

just type it?

[timid vault]

ig

[muted crystal]

.solved