14. In \( \triangle Q R S, m \angle Q=(4 x-17)^{\circ}, m \angle R=(x+6)^{\circ} \), and \( m \angle S=(10 x-4)^{\circ} \). Find the measure of each angle, then classify \( \triangle Q R S \) by its angles. \( m \angle Q= \)
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To find the measures of the angles in triangle \( QRS \), we start with the property that the sum of the interior angles in a triangle is \( 180^\circ \): \[ m \angle Q + m \angle R + m \angle S = 180^\circ \] Given: - \( m \angle Q = (4x - 17)^\circ \) - \( m \angle R = (x + 6)^\circ \) - \( m \angle S = (10x - 4)^\circ \) Substituting these into the equation gives: \[ (4x - 17) + (x + 6) + (10x - 4) = 180 \] Combining like terms: \[ 4x + x + 10x - 17 + 6 - 4 = 180 \] This simplifies to: \[ 15x - 15 = 180 \] Adding 15 to both sides: \[ 15x = 195 \] Dividing by 15: \[ x = 13 \] Now, substituting \( x \) back into the expressions to find each angle: 1. \( m \angle Q = 4(13) - 17 = 52 - 17 = 35^\circ \) 2. \( m \angle R = 13 + 6 = 19^\circ \) 3. \( m \angle S = 10(13) - 4 = 130 - 4 = 126^\circ \) Now we classify the triangle by its angles. With angles measuring \( 35^\circ \), \( 19^\circ \), and \( 126^\circ \): - Since one angle is greater than \( 90^\circ \) (specifically \( 126^\circ \)), triangle \( QRS \) is classified as an obtuse triangle. Thus, the measures are: \[ m \angle Q = 35^\circ, \quad m \angle R = 19^\circ, \quad m \angle S = 126^\circ. \] Therefore, \( m \angle Q = 35^\circ \).