如图，AB∥DE，∠C = 78°，则∠B + ∠D =（ ）。---Chart/Diagram Description: Type: Geometric figure. Main Elements: - Points: Five points labeled A, B, C, D, and E. - Lines/Segments: - A horizontal line segment AB. - An angled line segment BC connecting B to C. - An angled line segment CD connecting C to D. - A horizontal line segment DE. - A horizontal line extends from A to the left. - A horizontal line extends from E to the left. - Relative Position and Direction: - Point A is to the left of point B. - Point E is directly below A and to the left of D. - The line AB is parallel to the line ED. - Point C is located to the right of B and D, and between the vertical levels of B and D. - The segment BC slants downwards from B to C. - The segment CD slants upwards from D to C. - Segments BC and CD meet at point C, forming an angle ∠BCD. - Segments AB and BC meet at point B, forming an angle ∠ABC. - Segments DE and CD meet at point D, forming an angle ∠EDC.