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Types of Triangles, Symmetry and Congruence
Define an equilateral triangle
Define an equilateral triangle
Each side is the same length
Name this triangle 
Name this triangle
Isosceles, acute
What kind of triangle is this? 
What kind of triangle is this?
equilateral, acute
Right
What is an isosceles triangle?
What is an isosceles triangle?
Two sides have the same length
Name this triangle 
Name this triangle
Scalene, Acute
What is an obtuse triangle?
What is an obtuse triangle?
A triangle with one angle greater than 90 degrees
What is a scalene triangle?
What is a scalene triangle?
No sides are equal in length
Name this triangle 
Name this triangle
Obtuse, Scalene
What is an acute triangle?
What is an acute triangle?
All three angles are less than 90 degrees
What does congruent mean?
What does congruent mean?
Same shape, Same size
A line of _______________forms two congruent shapes
A line of _______________forms two congruent shapes
Symmetry
Are these two shapes congruent? 
Are these two shapes congruent?
Yes
Are these two shapes congruent? 
Are these two shapes congruent?
No
Other than a line of symmetry, this type of line can form congruent shapes.
Other than a line of symmetry, this type of line can form congruent shapes.
Diagonal
What does symmetry mean?
What does symmetry mean?
You can fold the shape in half and parts of it line up exactly
Name an insect that has symmetry
Name an insect that has symmetry
Butterfly
How many lines of symmetry does this shape have? 
How many lines of symmetry does this shape have?
3
Does this shape have symmetry? 
Does this shape have symmetry?
No
Name three letters with vertical symmetry.
Name three letters with vertical symmetry.
H,W,Y,U,O,X,V,M
How many degrees in a right angle?
How many degrees in a right angle?
90 degrees
If I have a triangle with 50 and 90 degrees, what is the last angle?
If I have a triangle with 50 and 90 degrees, what is the last angle?
40 degrees
How many sides does an octagon have?
How many sides does an octagon have?
8 sides
Name this figure. ![](http://images.yourdictionary.com/images/3999.16.pentagon.jpg
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Name this figure.<img src=)
Pentagon
Does a pentagon have symmetry?
Does a pentagon have symmetry?
yes
What does concave mean?
What does concave mean?
The shape is 'caving' in.
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What Would You Like To Risk?
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Go To The Final Question
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Edit This Game:
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