Answer:
72°
Step-by-step explanation:
If ABCD is a rhombus, then m∠ADB = m∠DBC = 36°
ΔADB is an isosles triangle, so m∠ABD = m∠ADB = 36°
Then m∠ABC = m∠ABD + m∠DBC = 36 + 36 = 72°
