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I believe trigo ratios are usually not covered in S1.

Draw a line to join BD.

Use area of triangle ABD to solve:

Area of triangle ABD = 1/2 * 11 * 8 cm² = 1/2 * 10 * BX cm²

BX = 8 *11/10 cm = 8.8 cm

 

cheers.

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Typo. Suppose to be BX = Sin(53.1) X 11 = 8.8cm###

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