Lesson 1 Angle proofs

Because MON are collinear how many degrees does that measure?

Which of the 3 postulates is being used here?

What number can you substitute in this blank to tell me what ∠NOP equals?

How many degrees is a line?

What do you call it when you replace items?

Did the 180 increase or decrease? or What did we do to get <MOP=40

Which of the 3 postulates is being used here?

What kind of point is L

Check the last two steps

How many degrees? (the box)

Angle that =90

Cuts in half (bisects)

Look at the box symbol in the picture

What property did we use to get to this step? how did we get 45? look above (2<ABD = 90)

We replaced <ABD with a number

What number can we substitute in for ∠FIG?

Same as replace

180 becomes 135, because what operation we did with 45 to move it to the other side?