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Question

Two angles measure a-60 and 123-2a.if each one is opposite to equal sides of an isosceles triangle,then find the value of a

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Solution

..we know that angles opposite to equal sides of an isosceles triangle are equal......
so ...
a-60 = 123-2a.
a+2a=123+60
3a= 183
a= 183/3
a= 61...

hence a equal to 61

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