Question

Q3: Match the column
1
А.
condition when the live wire comes in direct contact with the neutral wire
جا تا حدااا
The north pole of earth's magnet
is in the
Short-Circuiting
Amphoteric Oxides
name for group 18th elements
optical centre (0)
B geographical south
C. Noble
gases
D. A ray of light, when passes through it remains deviated
E. metal oxides which react with both acids as well as bases to form salt and water​

Answer 1

Answer:

ABCD is a quadrilateral

To prove : ∠AOB=

2

1

(∠C+∠D)

AO and BO is bisector of A and B

∠1=∠2∠3=∠4...(1)

∠A+∠B+∠C+∠D=360

(Angle sum property)

2

1

(∠A+∠B+∠C+∠D)=180...(2)

In △AOB

∠1+∠3+∠5=

2

1

(∠A+∠B+∠C+∠D)

∠1+∠3+∠5=∠1+∠3+

2

1

(∠C+∠D)

∠AOB=

2

1

(∠C+∠D)

Hence,Proved.