# Class 9 - Maths - Quadrilaterals (Worksheet-4)

**Q1: ABCD is a parallelogram such that its diagonals are equal. What is the measure of ∠ABC?**

**Answer**: Since diagonals are equal, it must be a rectangle or a square. ∴ ∠ABC = 90°

**Q2: Is rhombus a kite or a parallelogram?**

**Answer**: Both

**Q3: In a parallelogram ABCD, if ∠C = 80° then what is the measure of ∠A? **

**Answer**: In a parallelogram, opposite angles are equal, ∴ ∠A = ∠C = 80°