求解图片中的问题---**Question 6:** **Question Stem:** 如图,在三角形 ABC 中,AB=AC,线段 CD 是 AB 边上的高,∠1=20°,求∠2的度数。 (As shown in the figure, in triangle ABC, AB=AC, segment CD is the altitude to side AB, ∠1=20°, find the degree measure of ∠2.) **Chart/Diagram Description:** * **Type:** Geometric figure, specifically a triangle with an altitude drawn. * **Main Elements:** * **Points:** Three vertices of a triangle, labeled A (top), B (bottom left), C (bottom right). A point D is located on the side AB. * **Lines:** * Three straight lines form triangle ABC: segment AB, segment BC, and segment AC. * A straight line segment CD is drawn from vertex C to point D on side AB. * **Angles:** * An arc with the label '1' indicates an angle at vertex C, specifically ∠BCD. * An arc with the label '2' indicates an angle at vertex A, specifically ∠BAC. * A right-angle symbol is present at point D, where CD intersects AB, indicating that ∠CDB is a right angle (90 degrees). * **Labels:** The vertices are labeled A, B, C. The point on AB is labeled D. Two angles are labeled '1' and '2'. * **Relative Position:** Point D is located on the segment AB. Segment CD connects vertex C to point D.