Answer:
(2)
RSTV is a quadrilateral
Interior angles of a quadrilateral sum to 180
Sum of given angles:
- 2n + 6n + 2n + 5n = 180°
- 15n = 180°
- n = 12°
The angles are:
- 2*12°= 24°, 6*12° = 72°, 2*12° = 24°, 5*12° = 60°
(3)
Sum of angles of a regular 18-gon:
Each interior angle is:
(4)
Sum of interior angles of a convex heptagon (7-sided polygon):
(5)
Sum of exterior angles of any polygon is 360°
Each exterior angle of a regular nonagon (9-sided polygon) is:
