Answer:
Approximate only
Step-by-step explanation:
the perfect square smaller than 1.4 is 1, because 
Take the difference between the two, 1.4 -1 = 0.4
Put the whole with 1. the part will be as follow:

Note: just approximate!! with calculator, it is 1.18321
Answer:
C because it is not a right angle unlike the others
Step-by-step explanation: