CBSE Class 9 Answered
the exterior angles obtained on producing the base of a triangle both ways are 100° and 120°. find all the angles
Asked by raghavgargrg28 | 10 Sep, 2021, 05:11: PM
Expert Answer
Figure shows ΔABC whose sides AB and AC are extended .
If exterior 
B =100o , then interior B = ( 180 -100 ) = 80o
B =100o , then interior B = ( 180 -100 ) = 80o If exterior C =120o , then interior C = ( 180 -120 ) = 60o
C =120o , then interior C = ( 180 -120 ) = 60oThen A = ( 180 - 80 - 60 ) = 40o
A = ( 180 - 80 - 60 ) = 40oHence angles of ΔABC , A = 40o , B = 80o , C = 60o
A = 40o , B = 80o , C = 60o
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