4. Show by drawing (straight) lines that A and D or B and D or C and D would always be collinear.
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x
o
,2x
o
,....nx
o
=360
⇒x
o
(1+2+...+n)=360
Given x=36
o
⇒
2
n(n+1)
×36
o
=360
o
⇒
2
n(n+1)
=
36
360
⇒n=4
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