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A triangular garden bed is set out. In triangle XYZ, side XY = 10 m, side YZ = 18 m, and the angle XYZ = 90°.

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

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Worked solution — answer: 90.0

A = ½ab sin C

= ½ × 10 × 18 × sin 90°

= 90.0 m²

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