Question

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Answer 1

Answer: J (120)

Step-by-step explanation: Since triangle ABD is given to be an equalatiral triangle, we know that every interior angle is 60 degrees. Since line ABC is a straight line we know that if we subtract the lines angle (180) by the interior angle it goes through (60) we get the measure of angle DBC: 120 degrees

Answer 2

Explanation:

`\triangle ADB` is equilateral, so
`m\angle DBA=60^(\circ)`.

Using linear pairs,
`m\angle DBC=120^(\circ)`.