Question

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

Answer 1

As we know,

• $\cos(45) = \dfrac{1}{ \sqrt{2} }$

• $\dfrac{a}{c} = \dfrac{1}{ \sqrt{2} }$

• $\dfrac{a}{12} = \dfrac{1}{ \sqrt{2} }$

• $a = \dfrac{12}{ \sqrt{2} }$

• $a = 6 \sqrt{2}$

therefore, correct option is B