Question

In a triangle abc,if a=60degree,then[a+b+c][b+c-a]

Answer 1

Step-by-step explanation:

Given: In a triangle ABC, A=60°

to find: [a+b+c] and [b+c-a]

Solution:

from triangle ABC,

A + B + C = 180°..............(i)

=> 60° + B + C = 180° [given that A=60°]

=> B + C = 120°.....................(ii)

Now,

(A + B + C) = 180° [from equation (i)]

And,

(B + C – A) = ( 120° – A )

[taking the B+C value from (ii)]

= 120° – 60° [given that A=60°]

= 60°

Answer: [a+b+c]= 180° and [b+c-a]= 60°

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