Question

Repede,am nevoie urgent!​

Answer 1

Explicație pas cu pas:

29) ∢AOC + ∢BOC = 180°

x° + 4x° = 180°

5x = 180° => x° = 36°

∢AOC = 36°

∢BOC = 4•36 = 144°

∢AOD = ∢BOC => ∢AOD = 144°

∢AOE = ½•∢AOD = ½•144° = 72°

∢COE = ∢AOC + ∢AOE = 36° + 72° = 108°

30)

a) x° = 180° - 58° = 122°

b) 6x° + 2x° = 180°

8x° = 180° => x = 22,5°

c) 3x° + 6x° + 20° = 180°

9x° = 180° - 20°

9x° = 160° => x° = 17,(7)°

d) 2x° + 5x° - 30° = 180°

7x° = 180° + 30°

7x° = 210° => x° = 30°

31)

complement:

90° - 53°40' = 89°60' - 53°40' = 36°20'

suplement:

180° - 53°40' = 179°60' - 53°40' = 126°20'