In triangle PQR, cm, angle and angle . Find the length of QR to 1 decimal place.

Answer and explanation

Correct answer: C. 7.1 cm

  1. Step 1: Angle .
  2. Step 2: QR is opposite and PQ is opposite : .
  3. Step 3: cm.
Answer
7.1 cm.
Why not the others: 6.7 cm: the angle at was used instead of the angle at . 10.7 cm: this is the length PR, opposite the angle. 14.1 cm: the sine ratio was inverted.

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