Which of the following is the correct fact about angles at a point?
Angles at a point add up to $360^\circ$360°.
Angles at a point add up to $90^\circ$90°.
Angles at a point add up to $180^\circ$180°.
What is the value of $w+x+y+z$w+x+y+z?
Find the size of the unknown angle $x$x.
Find the size of the unknown angle $x$x.