Find the number of sides of a regular polygon if each exterior angle is equal to half its adjacent interior angle
The sum of exterior angle and its adjacent interior is 1800, that is,
e+i=1800
Since each exterior angle is equal to half its adjacent interior angle, therefore, substitute i2=e or i=2e.
e+2e=1800⇒3e=1800⇒e=18003=600
We know that the measure of exterior angle is e=(360n)0 where n is the number of sides.
Here, it is given that the exterior angle is e=600, therefore,
n=360e=36060=6
Hence, the number of sides is 6.