Answer:
23.
- Given
- Being Vertically Opposite angle
- Being Vertically Opposite angle
- From statement 1, 2 and 3
24.
- Given
- Definition of angle bisector
- Reflexive Property or being same side
- By Angle-Angle-SIde or AAS axiom
Explanation:
For proof 23.
Given:
∡1 ≅ ∡4
To Prove:
∡2 ≅ ∡3
Proof:
Statement ( Reason in bracket)
1. ∡1 ≅ ∡4 (Given)
2. ∡2 ≅∡ 1 (Being Vertically Opposite angle)
3. ∡3 ≅ ∡4 (Being Vertically Opposite angle)
4. ∴∡2 ≅ ∡3 (From statement 1, 2 and 3)

For proof 24.
Given:
BD bisects ∡ABC and ∡ADC
To Prove:
ΔABD ≅ ΔCBD
Proof:
Statement (Reason in bracket)
1. BD bisects ∡ABC and ∡ADC (Given) Angle
2. ∡ABD ≅ ∡CBD; ∡ADB ≅ ∡CDB. (Definition of angle bisector) Angle
3. BD ≅ BD (Reflexive Property or being same side) Side
4. ∴ΔABD ≅ ΔCBD (By Angle-Angle-SIde or AAS axiom )
