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Trava [24]
3 years ago
13

Please help will give thanks

Mathematics
1 answer:
7nadin3 [17]3 years ago
6 0

The value of CD = 12.687

Step-by-step explanation:

From the triangle ABC,

AC^{2}= AB^{2}+ BC^{2} ( by using Pythagoras theorem)

or, BC^{2}= AC^{2} - AB^{2}

or, BC^{2} = 144 - 36 = 108

BC = \sqrt{108} = 6\sqrt{3}

Now,

\frac{BC}{CD} = sin 55

or, CD = BC / sin 55

= 6\sqrt{3} / sin 55

=12.687

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