Question

If c= 12, what is the value of a?

Answer 1

As we know,

• 
  `\cos(45) = (1)/( √(2) )`

• 
  `(a)/(c) = (1)/( √(2) )`

• 
  `(a)/(12) = (1)/( √(2) )`

• 
  `a = (12)/( √(2) )`

• 
  `a = 6 √(2)`

therefore, correct option is B