find the missing angles
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Sum of all angles = 180
(3x-7)+55+(x+20)=180
4x+55+20-7=180
4x+68=180
4x= 180-68
4x= 112
x= 112/4 = 28
x=28
angle AOC= 3*28-7
=77
angle BOD= 28+20
=48
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Understanding Concept:
As we can see, that AB is a straight line and OC and OD are intersecting AB. This divides the line AB into 3 parts. AOC, COD & DOB.
The sum of all angles of a straight line is 180^{\circ} .
Solution:
Verifications:
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