That’s a black screen luv
Add 12 to both sides. leaving you with
3x=21
then divide 3 on both sides. leaving you with
x=7
hopefully that’s right!!!
Answer: ![18^{\circ}](https://tex.z-dn.net/?f=18%5E%7B%5Ccirc%7D)
Step-by-step explanation:
For a regular 20-gon, since there are 20 vertices that the polygon can be rotated and be mapped onto itself .Thus the order of symmetry of 20-gon is 2.
To find the degrees of rotational symmetry, we need to divide 360° by the order of symmetry.
Thus, the degree of rotation=![\frac{360^{\circ}}{20}=18^{\circ}](https://tex.z-dn.net/?f=%5Cfrac%7B360%5E%7B%5Ccirc%7D%7D%7B20%7D%3D18%5E%7B%5Ccirc%7D)
Hence, the smallest degree of rotation that will map a regular 20-gon onto itself=![18^{\circ}](https://tex.z-dn.net/?f=18%5E%7B%5Ccirc%7D)