cine imi rezolva repede punctele ab de la toate exercitiile ii dau coroana

Răspuns:
1. a) ( 6 - 2 ) × 180° = 4 × 180° = 720°
b) ( 10 - 2 ) × 180° = 8 × 180° = 1440°
2. a) ( 6 - 2 ) × ( 180° / 6 ) = 4 × 30 = 120°
b) ( 10 - 2 ) × ( 180° / 10 ) = 8 × 18 = 144°
3. l - numar laturi
a) 108 × l = 180 (l - 2) 180l - 108l = 360 ⇒ l = 5
b) 120 × l = 180l - 360 60l = 360 ⇒ l = 6