Correct Answer - Option 1 : 80°

**Given:**

Two angles of a quadrilateral are 100° each.

Other two angles are also equal

**Formula used:**

Sum of angles of a quadrilateral = 360°

**Calculation:**

Let the other two angles be x° each

⇒ 100° + 100° + x° + x° = 360°

⇒ 2x° = 160°

⇒ x° = 80°

∴ Measurement of each of the other two angles = 80°