Problem
If the length of Side \( A B \) is 21 units, the length of Side \( A C \) is units. Round the answer to the nearest 100th.
Solution
Step 1 ：Given: Side \(A B = 21\) units.
Step 2 ：Missing information: Need angle between sides \(A B\) and \(A C\) or length of Side \(B C\) in order to calculate Side \(A C\).
