1, 2, 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30.
To prove a rhombus you need to show that the sides are congruent and the diagonals are perpendicular.
Sides:
















≅
≅
≅ 
Diagonals:
Use the slope formula: 


= -1


= 1
Slopes are opposite reciprocals so they are perpendicular.
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All of the sides are congruent and the diagonals are perpendicular so RMBS is a rhombus.
75 is your answer
Hope this helped
Happy Holidays!
Q-1.8+1.8=14+1.8= Q=15.8 hope this helps