Answer:
(1)
[ exterior angle is equal to the sum of interior opposite angles]
Similarly, is exterior to and
(1)
OR
is a regular pentagon.
is a regular pentagon and angles opposite to equal sides are also equal]
In
(1)
In
[for regular pentagon]
And [in regular pentagon all sides are equal]
[given, in a triangle, angles opposite to equal sides are also equal]
[in a triangle sum of all angles is ]
(1)
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