1. Triangle \( A B C \) has side lengths as follows. AB is 7 inches, BC is 12 inches and CA is 9 inches. List the angles from smallest to largest.
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To determine the angles from smallest to largest in triangle \( ABC \), we can apply the Law of Cosines. The smallest angle will be opposite the longest side, and the largest angle will be opposite the shortest side. Here, side \( BC \) is the longest at 12 inches, so angle \( A \) (opposite \( BC \)) will be the smallest, and angle \( C \) (opposite \( AB \)) will be the largest. This results in the angle order: \( A < B < C \). Calculating each angle using the Law of Cosines, we find angle \( A \) is approximately \( 34.13^\circ \), angle \( B \) around \( 77.19^\circ \), and angle \( C \) about \( 68.68^\circ \). Therefore, the angle order from smallest to largest is \( A < C < B \).