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What is a scalene triangle?

A triangle that are unequal.

kind of like this

Yes, all sides have different lengths.

|dw:1435628118651:dw|

In triangle FED, we don't know that any sides are congruent.

I got for A. QRT DEF, and GHI

so it would only be QRT?

|dw:1435628307134:dw|

|dw:1435628565788:dw|

(a) Triangles FED, JKL, and QRT

ok thanks

Ok. Now isosceles.
What is an isosceles triangle?

|dw:1435628698681:dw|

Can you explain it in words?
What do you know about lengths of sides in an isosceles triangle?

Umm, its kind of elongated in a way.

Specifically, an isosceles triangle is a triangle that has at least two congruent sides.

Now look in the figure of your problem.
Which triangles have at least two congruent sides?

GHI, AND ABC

|dw:1435628996774:dw|

Also MNP

(b) Triangles ABC, GHI, MNP

But its right? how does it have same sides?

You mean MNP?

yes

oh ok thanks

|dw:1435629184547:dw|

Ok, next is (c).
Which triangles are right triangles?
A right triangle has one right angle.

MNP AND DEF?

|dw:1435629246793:dw|

Correct.
(c) Triangles EDF and MNP

Now (d), equilateral triangles.
An equilateral has all three sides congruent.

ABC, JKL

(d) Triangle GHI

is there a difference betwen the lines on ABC and GHI

aww ok

Finally, we get to (e).
Do you know what an obtuse triangle is?

(Hint: think of a right triangle, but substitute obtuse for right.)

yes it means that it's greater then 90 degrees.

than

Correct.
Which triangles have one angle of more than 90 degrees?

QRT

Correct, but I think that JKL also has an obtuse angle.
|dw:1435630158625:dw|

(e) Triangles JKL and QRT

oh ok

Thank you so much for all the help I needed it!

You are welcome.