Answer: C. 31.5
Step-by-step explanation:
You only need to find the area of the rhombus.
Rombus formula: pq/2
So 7*9 = 63/2
=31.5
Percentage Calculator: 11.25 is what percent of 225? = 5
(a+b)(a-b) = a^2 - b^2
(1+5/6) (1-5/6) = 1^2 - (5/6)^2 = 1 - 25/36 = 36/36 - 25/36 = (36-25)/36 = 11/36
11/36 is your answer
