Angles on a Straight Line


 
 
Concept Explanation
 

Angles on a Straight Line

Angle on a Straight Line:

Angles on one side of a straight line always add to 180 degrees.

30° + 150° = 180°

When a line is split into 2 and we know one angle, we can always find the other one.

angle 180 degrees

Solved Examples:

Example: We know one angle is 45°, what is the other angle "a" ?

Angle a is 180° − 45° = 135°

   angle 45 degrees

Example: What is angle "b" ?

Angle b is 180° minus the sum of the other angles.

Sum of known angles = 45° + 39° + 24°Sum of known angles = 108°

Angle b = 180° − 108° = 72°

angle b
Sample Questions
(More Questions for each concept available in Login)
Question : 1

In the given figure AOB is a straight line.Find

(i) angle BOC

(ii) angle AOC

Right Option : B
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Explanation
Question : 2

Two lines AB and CD intersect at O. if  angle AOC+angle COB+angle BOD=270^0 Then find  angle AOD is ___________________

Right Option : C
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Explanation
Question : 3

Identify that angle 3+ angle 4+ angle 5 = ? 

Right Option : B
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Explanation
 
 
 
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