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Question

.In each case; given below, find the value of x in terms of a, b and c.
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A
x = b + a - c
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B
x = b - a - c
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C
x = a - c - b
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D
x = a - c + b
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Solution

The correct option is B x = b - a - c
Join BD
In BDC,
CDB+BCD+CBD=180 (Sum of angles of triangle)
CDB+CBD+b=180
CDB+CBD=180b
Now in ABD
BAD+ADB+ABD=180 (Sum of angles of triangle)
BAD+ADC+CDB+ABC+CBD=180
a+x+CDB+CBD+c=180
a+x+180b+c=180
x=bac

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