Question

if m∠abc = 130° and m∠dbc = 30°, then m∠abd = ?°

Explanation:

Step1: Identify angle relationship

∠ABC = ∠ABD + ∠DBC

Step2: Substitute known values

130° = ∠ABD + 30°

Step3: Solve for ∠ABD

∠ABD = 130° - 30° = 100°

Answer:

100