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see, first of all put angle sum property of triangle and prove that it is 180°.
then take each exterior angle and prove that is is 180°-corresponding interior angle (straight line angle).
then using first one prove that 2nd eqn is equal to 360°
then take each exterior angle and prove that is is 180°-corresponding interior angle (straight line angle).
then using first one prove that 2nd eqn is equal to 360°
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