Texas Math Models

Try “number line” or “4.5D”

Angles against a right angle

acute, right, obtuse

G4

Measure every angle against a square corner. The biggest one decides.THE MEASURING STICKright triangleone square cornerexactly one angle is a right angleCOMPARED TO ITacuteall three smallerobtuseone is biggeronly the biggest angle decides the namea triangle has at most ONE angle that is right or bigger; the other two must fit

How this one works

How

find the biggest angle, then compare just that one to a square corner.

Best when

you have to call a triangle acute, right or obtuse.

The same problem, other ways