Question

ABCD is a quadrilateral . DO and CO BISECT angles D and C respectively and meet at point O .Then A+B = A)angle doc B)2angle doc c)3angle doc d)none of these

Answer 1

Answer:

Angle COD= 1800- 1/2angle C-1/2 angle D=1800-1/2(angle C+D)----------(1)

Angle (A+B+C+D)=3600

AngleC+D= 3600 - AngleA- angle B--------------(2)

Substituting (2) in (1)

Angle COD= 1800-1/2(3600- angle A- Angle B)

Angle COD= 1800-1800+1/2 Angle A + 1/2 Angle B= 1/2(Angle A+ Angle B)

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Step-by-step explanation: