Dau coroana!!!!!!!!!!!!!!!!!!!!!

2.

5 unghiuri proprii: CBD, DBH,HBA, BAF, FEG...(NU TREBUIE SA FIE 0 SAU 180 DE GRADE)

2 ung alungite: CBA, AEF

2 ung nule: FAE, AFE

DBH=CBA-CBD-HBA=180-53-37=90

3.

a. [tex]5^\circ \\b) 18^\circ 45'-7^\circ 28' 30'' =18^\circ 44' 60''-7^\circ 28' 30''=11^\circ 16' 30''\\c)180-38=142^\circ \\d) 180-37^\circ 4''=179^\circ 59' 60''-37^\circ 4''=142^\circ 59'56''[/tex]

4.

a) 25 grade

b) 115 grade

2

b) - 5 unghiuri proprii:  FEG; GEA; CBD; DBH; HBA

- 2 unghiuri alungite: CBA; AEF

- 2 unghiuri nule: FAE; AFE

c) m(∡DBH)=180°-m(∡CBD)-m(∡HBA)=180°-53°-37°=90°

3

a) 38°+7°-40°=5°

b) 18°44'60''-7°28'30''=11°16'30''

c) 180°-30°=142°

d) 179°59'60''-37°00'04''=142°59'36''

4

a) 90°-65°=25°

b) 180°-65°=115°