Question

given that m∠abd = 55° and m∠abc = 85°, find m∠dbc.

Explanation:

Step1: Identify angle relationship

∠ABC = ∠ABD + ∠DBC

Step2: Solve for ∠DBC

∠DBC = ∠ABC - ∠ABD

Step3: Substitute values

∠DBC = 85° - 55° = 30°

Answer:

D. 30°