Answer: option a.
Step-by-step explanation:
By definition, we know that:

Substitute
into the first equation, solve for the cosine and simplify. Then, you obtain:

As
then
:

Now we can find
:

Answer:
If two sides and the included angle of one triangle are equal to the corresponding sides and angle of another triangle, the triangles are congruent.
Answer:
572.40
Step-by-step explanation:
First find the tax
540 * .06 = 32.4
Add this to the original cost
540+32.4 =572.40