Texas Math Models

Two angles that meet

the parts make the whole

G4

Two angles meeting along a shared ray add to the whole angle.35°?80°the parts add to the whole35 + ? = 8080 − 35 = 45°on a straight line the whole is 180180 − 130 = 50°the shared ray belongs to both angles and is counted once

How this one works

How

the two parts add up to the whole angle, so subtract to find a missing part.

Best when

two angles sit side by side and share a ray.

The same problem, other ways