Answer:
15. (B) 47 degrees
16. (A) A square is always a parallelogram
17. (A) 17
18. (C) 16
19. (A) 2
Explanation:
15. In a rhombus, all sides are the same length. If we draw a diagonal through it, then the two triangles that are left will be isosceles. Therefore, ADB and ABD are the same angle.
16. A square is always a parallelogram, but not vice versa (a parallelogram is always a square)
17. To find the median of a trapezoid, the equation is b = (a + c)/2, where a and c are the bases. Therefore, the answer is A.
18. This is an isosceles trapezoid, meaning WZ and XY are the same length. That means that WY and XZ are the same, allowing us the create the equation 3a + 7 = 7a - 5. Solve and find the answer.
19. Using the median formula b = (a + c)/2, we can solve the equation.