The answer should be ∆ABD is congruent to ∆CBD by reflection.
One of the properties of rhombus is its sides are congruent. Therefore, we will only need to find the length of one side using the distance formula. At line YZ, the distance is

D =

= √13
To get the perimeter, multiply one side to 4. Hence,
the perimeter is 4√13 (C)
The volume of the cup would be 82.74. I used to formula Volume= pi* radius squared * height
No, because the relation passes the vertical line test
5)
A. (30°) acute angle
B. (140°) obtuse angle
C. (90°) right angle
6)
A. The hypotenuse is side RT
B. Legs are sides RS and ST