Answer:
1. 67.5°
2. 12 sides
Step-by-step explanation:
1. interior angle of regular octagon: 180° x (8 - 2) = 1080°
each interior angle : 1080° / 8 = 135°
∠x = 1/2 x 135° = 67.5°
2. sides of regular polygon = 360/m of exterior angle
360 / 30 = 12
