Mathematics

From the adjoining figure find $$x$$,  i $$AOB$$ is a straight line. Hence complete the following 
Which is an acute angle?


SOLUTION
R.E.F image 
now ,we know 
$$\angle POA+\angle POB=180^{\circ}$$
$$x+10+x-10=180^{\circ}$$
$$2x= 180^{\circ}$$
$$[x=90^{\circ}]$$
NOW $$\angle POB=90+10=80$$
& $$\angle POA=90+10=100^{\circ}$$
$$ \angle$$ POB is acute angle.

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