82.0k views
1 vote
ASAP Can someone help with this problems just I only need which formula do I used I just need for 4,5 and 6 just tell me the formulas for Law of Cosines

ASAP Can someone help with this problems just I only need which formula do I used-example-1

1 Answer

4 votes

Step-by-step explanation:

The formula for law of cosines is:


a^(2) = b^(2) + c^(2) - 2bc(cosA)

This is written at the top of your paper.

The angle is substituted where the capital A is. The side opposite to the angle is the angle name's lowercase. The two other sides are b and c.

Substitute all the information you know, then isolate the variable that you do not know.

When your formula is rearranged to look like this:


(a^(2) - b^(2) - c^(2))/(- 2bc) = (cosA)

Solve the left side and punch into your calculator:

cos⁻¹(left side) to find the angle A.

User Jesper Blad Jensen
by
8.3k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories