Mark the Correct alternative in the following:
In a ∆ABC, if (c + a + b) (a + b – c) = ab, then the measure of angle C is
ac + bc – c2 + a2 + ab - ac + ab + b2 - bc - ab=0
– c2 + a2 + ab + b2 =0
a2 + b2 – c2 = - ab
By Cosine law,
Option C
1
Mark the Correct alternative in the following:
In a ∆ABC, if (c + a + b) (a + b – c) = ab, then the measure of angle C is
ac + bc – c2 + a2 + ab - ac + ab + b2 - bc - ab=0
– c2 + a2 + ab + b2 =0
a2 + b2 – c2 = - ab
By Cosine law,
Option C