In the adjoining figure, show that 
+
+
+
+
+
=360°
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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in the ratio 1:3 and AD=DB. Determine the value of.
ABC the angle bisectors of 
and
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.
ABC have been produced to D and E respectively. The bisectors of 
and 
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=40° find 
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