Question

if angle AOB:angleDOC=4:5 then find angle COB​

Answer 1

Since angle aob is 4 we will assume it as 4x and since angle BOC is 5 we will assume it as 5 x nd let angle COB be x then...

4x+5x=10x

10x=180

x=180/10=18

therefore 4x=18x4=72

5x=5x18=90

therefore x=180-90+72

=180-162=18

therefore angle COB=18