hint: expand the lines with a ruler before you measure to get a better look at the angel
acute angle: less than 90 degrees
right angle: 90 degree angle
obtuse angle: more than 90 degrees
always check to see which way the angle is going, if it is not mark ask somebody. the way the angle goes can change what appears to be a n acute angle into an obtuse triangle fast. though usually an obtuse angle is less than 180 it can appear just in a different direction.
as which are which in the photo?
a- a line b-obtuse c- right d- line- e- acute f-right g-acute h-obtuse i- acute j- obuse
see how some seemed like another angle but without the arrow to show where the angle is going
