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