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, if l , m , n and /1=60^@, find /2....

, if `l , m , n` and `/_1=60^@,` find `/_2.`

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Solution:
As per the diagram.
'/_1=∠3' [ Corresponding angles ] -----'(1)'
`'/_2=/_4'` [ Vertically opposite angles ] -----'(2)'
Given,
`'/_1=100@=/_3' `[ from '{1}' ]
`'/_3+/_4=180@'` [ angles in a straight line ]
`'100+/_4=180@'`
∴`'/_4=80@'`
From '(2)'
`'/_4=/_2=80'`
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RD SHARMA-LINES AND ANGLES -All Questions
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