Warm Up: pg. 218 # 19-20

4.3 Tiangle Inequalities pg. 213 to 218

There are many different kinds of triangles:What happens when the length of the yellow line changes?

(blue and red line are ≅ and do not change in length)

When you make a triangle the goal is to have a shape with 3 sides

What do you have to know about the measures of the sides to make a triangle?

Can you make a triangle out of these three lines?

http://www.keymath.com/x3017.xml

So what does this mean......

Let's see what the Dynamic Exploration does......

So, using this information, HOW do you find which angle is the largest and which one is the smallest angle in a triangle? pg. 215

So let's try it, Which is the largest angle and what side is opposite ?

So then... WHAT goes in the blank?

90°55°

35°

a

b

c

Which side has shortest length, WHY?

Which side has longest length, WHY?

Let's Try It.....

a

b

c

Order the sides from greatest to least

70°

60°

So far we have studied Interior angles of triangles,

What about exterior angles..... pg. 215

See if you can get these answers AND then tell me what goes in the blank for C-23 on pg. 216

HINT: What do you notice about the angles that DO NOT share a vertex?

Let's fill it in.....

Let's try some practice....