Q. 2 A5.0( 4 Votes )

In a triangle ABC, A = 80° and AB = AC, then B is ______
A. 50°

B. 60°

C. 40°

D. 70°

Answer :

In the given ∆ABC,


A = 80° and AB = AC


⇒ ∠B = C {angles opposite to equal sides are equal}


Also, sum of all the angles of a triangle is 180°.


⇒ ∠A + B + C = 180°


2B = 180° - 80°


2B = 100°


⇒ ∠B = C = 50°

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
NCERT | Imp. Qs. on MensurationNCERT | Imp. Qs. on MensurationNCERT | Imp. Qs. on Mensuration46 mins
Extras on ProbabilityExtras on ProbabilityExtras on Probability44 mins
Champ Quiz | Important Qs. on PetroleumChamp Quiz | Important Qs. on PetroleumChamp Quiz | Important Qs. on Petroleum30 mins
Operations on Algebraic ExpressionsOperations on Algebraic ExpressionsOperations on Algebraic Expressions51 mins
NCERT | Discussion on SoundNCERT | Discussion on SoundNCERT | Discussion on Sound44 mins
Champ Quiz | Important Questions on CoalChamp Quiz | Important Questions on CoalChamp Quiz | Important Questions on Coal38 mins
Quiz | Imp. Qs. on LightQuiz | Imp. Qs. on LightQuiz | Imp. Qs. on Light36 mins
Rapid fire quiz on LightRapid fire quiz on LightRapid fire quiz on Light39 mins
Quiz | Solve Qs. on  SentencesQuiz | Solve Qs. on  SentencesQuiz | Solve Qs. on Sentences38 mins
Champ Quiz | Important Questions on ResourcesChamp Quiz | Important Questions on ResourcesChamp Quiz | Important Questions on Resources29 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

In a triangle ABC, B = 70°. Find A + C.

Karnataka Board - Mathematics Part I