Question

Va roggg ex.12,13. Ofer 55 puncte+coroana.Va multumesc!​

Answer 1

12)

∡COL/∡TOL = 7/2 => ∡TOL = 140×2/7 = 280/7 = 40 °

∡COT = ∡COL + ∡TOL = 140° + 40° = 180° =>

C, O, T = coliniare

13)

a)

∡CBD = 75%×60° = 3/4×60° = 180°/4 = 45°

∡ABC = 45°                                                       } => ∡ABC = ∡CBD

b)

∡ABD = ∡ABC + ∡CBD = 45° + 45° = 90°