SOLUTION
Given the question in the image, the following are the solution steps to answer the question.
STEP 1: Explain the formula to use
Using the cosine rule which states that:

STEP 2: Write the given sides

STEP 3: Find the value of z

Hence, the indicated length is 4.0
Yes it is always true a biconditional statement is defined to be true whenever both parts have the same truth value.
Your answer is going to be 21 u just subract from the number to get ur answer
answer:
A and Q
B and R
C and P
the reason is all sides are congruent
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