Question

If point $P$ lies on the unit circle as shown in the figure above, then $x+y=$

• A. $0.37$
• B. $0.50$
• C. $0.78$
• D. $0.87$
• E. $1.37$

Answer 1

The correct option is E $1.37$

Given, radius of circle is $1$.
$\Rightarrow x=1\times \cos 60=\frac{1}{2}=0.5$
$\Rightarrow y=1\times \sin 60=\frac{\sqrt{3}}{2}=0.866$
$\Rightarrow x+y=0.866+0.5=1.37$