M3 · Thinker
Geometry
Angle rules
Formula
triangle = 180 deg; straight line = 180 deg; full turn = 360 deg
Rule
Angles in a triangle add to 180. On a straight line they add to 180. Angles at a point add to 360.
Example
A triangle with 50 and 60 has a third angle of 70.
Tip
Look for right angles and straight lines as anchors.
Learn this concept
Angles