help solve the following math promblems

129/41 B Cc 6. Points A, B, and C at right are collinear. What's wrong with this picture? 7. Yoshi is building a cold frame for his plants. He wants to cut two wood strips so that they'll fit together to make a right-angled corner. At what angle should he cut ends of the strips? i c J 2 a 8. A tree on a 30 slope grows straight up. What are the measures of the greatest and smallest angles the tree makes with the hill? Explain. 9. You discovered that if a pair of angles is a linear pair then the angles are supplementary. Does that mean that all supplementary angles form a linear pair of angles? Is the converse true? If not, sketch a counterexample. 10. If two congruent angles are supplementary, what must be true of the two angles? Make a sketch, then complete the following conjecture: If two angles are both congruent and supplementary, then _2 . 11. Using algebra, write a paragraph proof that explains why the conjecture from Exercise 10 is true. 12. Technology Use geometry software to construct two intersecting lines. Measure a pair of vertical angles. Use calculate to find the ratio of their measures. What is the ratio? Drag one of the lines. Does the ratio ever change? Does this demonstration convince you that the Vertical Angles Conjecture is true? Does it explain why it is true