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°.
Find the size of the missing angle.
Find the size of the missing angle.
Find the size of the missing angle.
measures and constructs angles, and applies angle relationships to find unknown angles