In Exercises 9-13, the diagonals of rhombus ABCD intersect at M. Given that mZMAB = 530, MB = 16, and AM = 12, find the indicated measure.
9. m2 AMD
А
B
53
10. m2 ADM
16
12
11. mZACD
M
12. DM
13. AC
D
с
14. A quadrilateral has four congruent angles. Is the quadrilateral a parallelogram?
Fynlain your reason

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

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