∠RQU is an obtuse angle.
∠SQU is an acute angle.
∠RQT is an right angle.
m∠RQU = 19 + 71 + 18 = 108°.
Therefore, ∠RQU is an obtuse angle.
m∠SQU = 71 + 18 = 89°
Therefore, ∠SQU is an acute angle.
m∠RQT = 71 + 19 = 90°
Therefore, ∠RQT is an right angle.
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