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A sketch of a rectangular ground ABCD is given here.

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(i) Based on the information marked on the sketch, find the length of AD to the nearest whole number.

Any Ideas on how to begin?

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1 Answer

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$$\tan 35^{\circ} = {AD\over 40}$$

$$\tan 15^{\circ}= 2 - \sqrt{3}$$

for $\tan 20^{\circ}$ maybe use multiple angle formulae and solve the cubic.

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