Question

answer the following

Answer 1

Answer:

Sum of all angles = 360°

130° + 85° + 65° + x° + 3x° = 360°

280° + 4x° = 360°

4x° = 360° - 280°

4x° = 80°

x° = $\frac{80}{4\\}$°

x° = 20°

∴ ∠AOB = x° = 20°

∴∠DOE = 3x° = (3×20)°

                    = 60°