Question

7 si 8 repede va rog dau 40 de p si coroana

Answer 1

Răspuns:

7.

P=2L+2l

l=(4•15)/5=12

P=2×15+2×12

P=54 cm

8.

m(<A)+m(<D)=180°

2m(<D)-12°+m(<D)=180°

3m(<D)=192°

m(<D)=64°=m(<C)

m(<A)=116°=m(<B)

Answer 2

7)

P = 2L + 2l

= 2L + 2×4L/5

= 2×15cm + 8×15cm/5cm

= 30cm + 24cm

= 54 cm

8)

A + D = 180° (suplementare)

A = 2D - 12

INLOCUIM

(2D - 12) + D = 180°

3D = 192°

D = 64°

A = B = 64°×2 - 12 = 128° - 12° = 116°

C = D = 64°