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const2013 [10]
3 years ago
9

Can someone solve this question?

Mathematics
1 answer:
Rom4ik [11]3 years ago
3 0

The triangles are isosceles. The following notation are for the angles. For example ABD is refer to the angle located in the B vertex, formed by the segments AB and BD.

ABD = ADB\\40 + 2ADB = 180\\ADB = 70 = ABD\\

70 +  DBC + 30 = 180\\DBC = 180 - 100 = 80

Then

BCD = BCD\\2BCD + 80 = 180\\BCD = 50



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