CBSE Class 9 Answered
In the
given figure, Prove that x = a + b + c.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
Construction: We join B and D and produce to E
Proof: 
1 +2 =b and 3+4=x … (i)
In 
ABD,3 = 1+ a [external
angle property]
In BDC, 4 =2 + c [external
angle property] … (ii)
Adding (i) and (ii), we get
3+4 = (1+2) +a +c
x= b +
a + c using (i)
Answered by | 04 Jun, 2014, 03:23: PM
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