Question

In figura alaturata AD intersectat cu CE ={B} ,iar m(∡DBE) = 60°
a) daca m(∡ABC ) = (3x)° ,aflati x.
b) daca m(∡ABC)=(2X-14)° ,calculati 4X-3
c)Daca m(∡DBC),atunci aflati m(∡DBC).
repede dau coroană la răspunsul correct!!​

Answer 1

Răspuns:

∡DBE=∡ABC (opuse la vf)

a)3x=60°=>x=20°

b)2x-14=60

2x=74

x=37

4×37-3=145

c)∡ABC=1/2∡DBC

60°=1/2∡DBC=> ∡DBC=2×60°=120°