Question
Is it possible to have a regular polygon whose interior angle is: 135°

Answer

No. of. sides = n
Each interior angle = 135°
$\therefore \frac{(2 n -4) \times 90^{\circ}}{ n }=135^{\circ}$
180n - 360° = 135n
180n - 135n = 360°
$n =\frac{360^{\circ}}{45^{\circ}}$
n = 8
Which is a whole number.
Hence, it is possible to have a regular polygon whose interior angle is 135°.

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