Every proof needs Given and Prove statements. Use the endpoints on the diagram to write a Given statement indicating the down tube is longer than the top tube. Prove the relationship between the opposite angles of the given sides.

Down tube AC > top tube AB, In A triangle, side opposite greater angle is greater.

Step-by-step explanation:

1. Top tube AB, down tube, AC, and seat tube, BC form a triangle,  1 Given

3. Segment AB = Segment AX,     3. Definition of isosceles triangle

4. m∠1 = m∠2,                            4. Base angles of an isosceles triangle

5. m∠2 = m∠3 + m∠C,               5. External angle of a triangle is equal to the sum of the two interior opposite angles

6. m∠1 = m∠3 + m∠C,                 6. Substitution

7. m∠B = m∠1 + m∠3,                   7. Angle addition postulate

8. m∠B = m∠3 + m∠3 + m∠C,      8. Substitution

9. m∠B > m∠C,                              9. Definition of greater than  

Down tube AC > top tube AB, In A triangle, side opposite greater angle is greater.

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sweetheart, there isn't a cube below.