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in trangle ABC angle C=90 degrees, AB=c ,BC= a, AC=b and b 2 =ac then cos B= 1)1/2 2)root5 -1/2 3)root5-1/4 4)1/4 full length solution plss

in trangle ABC angle C=90 degrees, 
AB=c ,BC= a, AC=b and b2=ac
then cos B=
1)1/2
2)root5 -1/2
3)root5-1/4
4)1/4
 full length solution  plss
 

Grade:11

1 Answers

Saurabh Koranglekar
askIITians Faculty 10336 Points
2 years ago
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