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A sail on a yacht is a triangle. In triangle XYZ, side XY = 20 m, side YZ = 12 m, and the angle XYZ = 120°.

Find the area of the triangle, correct to one decimal place (in square metres).

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Worked solution — answer: 103.9

A = ½ab sin C

= ½ × 20 × 12 × sin 120°

= 103.9 m²

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