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Question

If ΔABC is a triangle such that AB = BC and B=120, then what are the other pair of angles?

A
30,30
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B
60,30
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C
45,30
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D
50,30
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Solution

The correct option is A 30,30
Given,
In ΔABC
AB = BC
B=120
A=C ..(i)
[Angles opposite to equal sides are equal]

Now,
A+B+C=180
A+120+A=180 ..[from (i)]
2A+120=180
2A=60
A=30
C=30
Tha pair of angles are 30,30

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