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Geometry. Answer the question in the photo.

Geometry. Answer the question in the photo.-example-1

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2 votes

Answer:

5

Explanation:

Since, A, B, C, D are collinear.


\implies A - B - C - D \\ </p><p> \therefore \: AD = (AB + BC) + CD \\ \therefore \: 18 = AC + CD.. (\because AB + BC =AC) \\ \therefore \: 18 = 8 + CD \\ \therefore \: 18 - 8 = CD \\ \therefore \: 10 = CD \\ \\ \because \: BC + CD = BD \\ BC = BD - CD \\ BC = 15 - 10 \\ BC = 5 \\

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