Q. 214.7( 10 Votes )
<span lang="EN-US
Answer :
Proof
In triangle BDF,
+
+
= 180°[Sum of angles of triangle] _______________ (i)
In triangle BDF,
+
+
= 180°[Sum of angles of triangle] _______________ (ii)
From equation (i) and (ii),
(
+
+
) + (
+
+
) = (180°+180°)
⇒ 
+
+
+ 
+
+
= 360°Proved.
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