Answer:
0.9
Step-by-step explanation:
0.9
Answer:
a = 6
Step-by-step explanation:
Area = 36 
Only one number will make this missing length true.
Obviously it's a square so one number x one number will equal to 36 
6 x 6 = 36 
A acute angle is always less than 90 degrees. So the answer is A.